4r70w 1st gear problem4r70w 1st gear problem

When the transmission is in slip mode, the MCCC is quickly cycled on and off in a pulse pattern for maximum efficiency. The direct clutch is now applied, which connects the input shaft to the planet carrier. If the seal lip is pointed away from the bore, it does not hold pressure and the servo piston does not function. The valve body is responsible for controlling the flow of fluid While youre at it, check the manual shift linkage and manual shift valve. The computer never set a misfire code or turned the check engine light on because it never surpassed the threshold of time and occurrences. The direct drum was burnt, as well. Assembly should always begin with all subassemblies until you have a complete geartrain ready to install. The AODE/4R70W rotating mass is similar to that of the AOD. Line it up for the overdrive band servo piston. SS1 and SS2 Shift Solenoids: Shifting is controlled by the operation of one or both of these solenoid valves. Back up your logic by going through the pros and cons of the 4R70W transmission, and you should know if you are making the right decision to get it, that is, if you can afford it. Never reuse old bearings or seals. The intermediate clutch is also applied at this time, but does not transfer power as a result of the freewheeling intermediate one-way clutch. Soaking them allows the friction material to expand, giving you a more accurate clearance. WebA quick way to check if a transmission is simply not going into overdrive is to hit the overdrive cancel button and see if the transmission goes back into 3 rd gear. Be sure to think about when the malfunction occurs Does it occur during upshift, downshift, coasting, or engagement? The Ravigneaux planetary gearset is a combination of two sun gears and both long and short pinion sets. The intermediate clutch discs and plates stack up like this. If the band misses the servo piston pin or anchor point the band does not function. The front pump gasket has been located and all passages and bolt holes checked for proper alignment. The 4R70W transmission tends to slip on the 1st gen Ford Crown Vic. Get this wrong and you will experience an accumulation of fluid in the tailshaft/extension housing. The planetary one-way clutch overruns. Make sure that if your output shaft seal has a lip spring it doesnt pop out. Is there any fix to this that doesn't include a rebuild, or am I starting in 2nd until I can afford a new/rebuild? Check the uid level and line pressure. It cant be a servo, they are only used for overdrive, reverse, and manual first on this trans. Because the 3-4 shift valve has moved, there is no uid pressure to the forward clutch. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Legal/Privacy. One planetary member is driven while the other is held. In part 2 of this series we show the transmission torn Check this pressure plate for freedom of movement before installing the pump. Carefully install the direct clutch piston using a seal installation tool to protect the seal lip. TRC installs frictions dry. Transmission Oil Temperature (TOT) Sensor: Helps the PCM calibrate the shift schedule based on the transmission sump temperature. Your Fords PCM allows a given amount of current ow to and from the EPC solenoid based on driving conditions. Park is the last manual detent when the linkage is full forward. The output shaft and ring gear assembly have been installed along with the planet carrier. Take note of how the rollers fit into the cage. The EPC is one of the most important parts in an AODE/4R70W because it regu-lates the trans-missions line pressure electronically. Transmission problems are often perceived as mechanical or hydraulic when they are actually electrical issues that adversely affect the hydromechanical parts. When the solenoids are energized, the valves are open. 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Torque the extension housing bolts to 16 to 20 ft-lbs. Do not take shortcuts. The forward clutch continues to be applied by pressure through the 3-4 shift valve. The other four thickness options are green (.050 to .054 inch), yellow (.068 to .072 inch), red (.102 to .106 inch), and blue (.119 to .123 inch). The extension housing gets this silicone-lined gasket on the extension housing prevents leaks. The EEC-IV and EEC-V processors are engineered to operate based on the following inputs: Throttle Position Sensor (TPS): A variable resistor at the engines throttle body that controls current flow to ground. Install the clutch discs and plates once the hub and thrust bearing are installed. So the valve body on 4r70w and maybe 4r75w tend to wear out so replacing the whole valve body is recommend instead of trying to fix the valve bores in my opinion you are eliminating further issues, valve body on eBay good with one year warranty 65$ bucks thats super cheap fix for these mysteriously instantaneous loss of forward gears without This drain hole must be at 6 oclock. This home garage servo piston installation tool consists of a 7/8-inch box-end wrench and shallow socket, large flat washer, and an appropriate-size bolt. Cart First gear isnt usually the first to go (no pun intended) on the 4r70w. The lip needs to face the fluid. Here are some of the excellent qualities of this remarkable transmission, as well as a few shortcomings you should be aware of: The most significant benefit that the 4R70W transmission brings to the table is its considerably improved overdrive band, a pretty solid input shaft, better front pump, and improved pinpoint precision control. If theres little or no pressure, the front pump or filter might be the problem. All that is needed now are clutch discs between the clutch plates. Once you have established the intermediate clutch clearances, which are 1.634 to 1.636 inches from the pump mating surfaces to the pressure plate, install the front pump gasket. Apply transmission assembly lube on all contact surfaces. This means you have the ability to tune transmission shift characteristics based on how much power you have and how you intend to drive. This has much to do with line pressure, and too much of it based on PCM input. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. When in drive, first gear slips but when in manual first gear, no slippage. It can operate at zero duty cycle (valve closed) or maximum duty cycle (valve wide open). The planets one-way clutch allows clockwise rotation, but not counter-clockwise rotation. It can also mean reverse clutch piston seal problems. Pressure causes the lip to seal. The same thing applies to automobiles with the AOD Electronic Controls in the 1990s. 132 N. Howard St, Akron, OH 44308 were also part of its components. My 4R70W transmission is giving me trouble. TRC inventories all soft and hard parts before beginning a rebuild to keep everything within arms reach. With this sequence of events, pressure goes to the forward clutch pack through the orifice control valve and the 2-3 backout valve. Installing them wet gives them a good start against freshly resurfaced clutch drums. Because these springs are attached to the pressure plate, they should all be present and in serviceable condition. It could also be a misfire. Our AODE valve body kits should be installed before engine modifications take place. If your AODE/4R70W experiences no 3-4 upshift, it is a sticking 3-4 shift valve, overdrive servo issue, or a failed overdrive band. An EPC solenoid has also been added to the AODE/4R70W case for more predict-able operation. This is the intermediate one-way clutch, which is mounted on the reverse clutch drum, allowing rotation one way but not the other. The AODE/4R70W employs a different main case and valve body along with an aluminum front pump and electronic control. Next, we suspected the intake manifold. It allows the seals to transition smoothly without binding. I put it all back together and it does the same thing now except when you give it some gas (1500 RPM) It'll start to creep and you can tell the clutches are slipping The reverse clutch/band pressure and function are checked by dropping the valve body and doing a visual inspection of the low-reverse band servo and anchor pin. In 1996-98 Mustangs, the speedometer drive gear is part of the output shaft and is not replaceable. Install a new overdrive band and anchor it to the pin. The direct clutch hub goes up against the number-7 thrust bearing. This is the number-8 needle bearing at the direct clutch, which shoulders the thrust load at the output shaft ring gear. The twin solenoids are shift solenoids that are on/off only with either each on or both on, depending on the shift timing. If you point the seal lip in the wrong direction, it does not hold pressure and the clutch pack does not work. S1. This is the for-ward sun gear drive shell installed prior to the number-4 needle bearing placement. This cookie is set by GDPR Cookie Consent plugin. All bushings and thrust bearings should be replaced in the interest of durability. Install the forward clutch frictions alternately between the steels. Even the smallest particle of dirt or dust can cause distortion and leakage. Begin the pump inspection by verifying the bolts are torqued correctly and the stator support is secure. And for this to happen successfully, the manufacturers had to sacrifice a handful of the speed and performance features that older models exhibited. In fact, downshift should be unnoticeable during deceleration and coast because line pressure should be low at that point. The MLPS is outside and is tied to the manual shift linkage. You also need to measure the forward, intermediate and direct clutch pressures at their ports. Is a Transmission Tune up Necessary for My Cars Performance? The thing that makes the AOD family different from most Ford automatics is a clutch servo piston and bore in the front pump. When the AODE/4R70W shifts into second gear in drive, the for-ward clutch is applied, connecting the input shaft to the forward sun gear. The cookie is used to store the user consent for the cookies in the category "Other. The planet carrier splines inside the ring gear with gentle back-and-forth twisting to achieve proper engagement. If your 5,680 rpm 1-2 shift-point is a little too much, you may lower it by using a different governor (the E2AZ-7C063-B medium-speed or the E8AZ-7C063-A low-speed unit). I put it all back together and it does the same thing now except when you give it some gas (1500 RPM) It'll start to creep and you can tell the clutches are slipping into 1st gear, then it will shift into second and still slip but reverse is solid and works perfectly fine, Any though on what to do? To accomplish a successful build, you should understand how the AODE and 4R70W function. In first gear in the drive range, the SS1 is on and the SS2 is off. The AODE/4R70W direct clutch is a stronger stamped steel with more clutch surface area for durability and power transfer. Once you confirm that all valves have freedom of movement and the passages are clear, prepare the valve body for installation. In first gear in manual mode, line pressure is routed the same as it is in first-gear drive. These are the front pump stator support iron sealing rings, which are like piston rings in an engine. Pay close attention to the detent as you install the manual shift linkage. Be sure you know the proper location for these sealing rings and seals. The transmission must be removed to check torque converter function. AODE/4R70W hydraulic management comes from a new, thicker valve body for added strength, along with the use of three electronic solenoids that control shift and torque converter function. If clutch and servo are an issue then internal work is needed. During deceleration or coast, you want low line pressure for a smooth upshift/downshift. These Twist and wiggle the stub shaft and feel for proper seating. Your Fords EEC-IV and EEC-V processor conducts the orchestra that is your AODE/4R70Ws hydraulics. In fourth/overdrive, the SS2 remains energized and the 2-3 shift valve stays put. Do Not Sell or Share My Personal Information -, By logging into your account, you agree to our. Lubricate the bolt threads and check the bolt travel. It does what the governor did hydraulically. If the spring is missing and cannot be found, replace the seal. The next items to check are the number-3 and number-4 sealing rings. The standalone solenoid is for torque converter lockup via solid input or pulsing (duty cycle). Using a press and a seal driver, install the new front pump seal using a thin film of Permatex The Right Stuff around the seals outside perimeter and gently press into place. It wasnt all that different from the FMX 3-speed automatics since common FMX components such as the Ravigneaux gear train, etc. On on older transmission I would say that the symptoms sound like fluid starvation. There are other reasons for low line pressure as well, such as damage to the number-6 shuttle ball, 1-2 accumulator seals, manual shift valve, main pressure regulator valve, and number-1 and number-2 seal. The plates should have been resurfaced or replaced. Wet frictions allow for more accurate clearances during assembly. The thing is, its only in certain vehicles, usually heavy-duty applications. Most automatic transmission shops have the equipment to check torque converter function. 4R70W tcc lock up in 1st gear. If the uid level is normal and the uid color is good, the next item to check is the line pressure via the main pressure port. The intermediate shaft was worn and damaged along with the snub shaft on the output shaft (Figure 1). Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. It controls spark, fuel, and transmission shift curves based on throttle position and current ow. The shift solenoids open the shift valves when they receive power. Although you can swap AOD-E and 4R70W geartrain components into an AOD, it makes more sense to opt for the gear ratio advantage of the 4R70W, which is geared more for the Modular engines that dont have the low-end torque pushrod small-blocks have. Online Buyer's Guide Although these clutches are dry, some transmission professionals prefer to soak them in transmission fluid first to get accurate clearances and the best results. If these seal ends overlap, you get internal leakage. If you dont have a press, just about any machine shop has one. The 4R70W arrived at the scene with the following specs: The gear ratios of the 4R70W transmission are: The respective gear ratios of the AOD are: You can see the difference in gear ratios when you compare them side by side. Written by George Reid and Posted with Permission of CarTechBooks. I put them in exactly as they came out and possibly could be that. If you were noticing less The 1-2 shift valve remains as is. Archive - Brief History of the Ford 4R70W Transmission, As mentioned earlier, no stock transmission is perfect in every aspect. While youre building subassemblies, closely inspect planet gears and bushings for abnormal wear and scoring. Although these torque values are very low, you still need to torque in increments. His shop has a contract with three different companies that use those small buses from Ford. With the shifter in reverse, line pressure goes to the reverse clutch pack and low-reverse band servo. Members The forward sun gear drive shell splines into the planet carrier and stub shaft. Filed Under: The Best Ford Tech Articles, Transmissions, 2023 DiY Ford. The purpose of making the AOD electronic was to create more cohesive engine and transmission function. Please register or login to enable Dark Mode. Rock these assemblies back and forth until the forward clutch is completely seated in the reverse clutch drum. Lose the spring and you will have slip-yoke leakage. Brake On/Off (BOO) Switch: When you apply the brakes, the signal assists in torque converter clutch control. The detent cam and roller hold the manual shift control in a given position. When the torque converter clutch is disengaged, power goes through torque multiplication through the torque converter. The AODE/ 4R70W differs from the AOD in input. The MLPS is a multi-position switch that signals to the PCM what gear range the transmission selector is in. 2001 Expedition, 4.6L engine, 4R70W transmission. A lone sealing ring (PN 87054-S96) goes in the top groove. Be very careful not to scratch the clutch piston. When you build, use new Torringtons if possible. Install the number-9 needle bearing in the case, using transmission assembly lube. This is the manual shift control and detent cam. Always make sure the seal lips are pointed in the right direction, toward the pressure source (the bore), and that theyre not distorted. The seal lip should be pointed toward the pressure source (inside the bore). As the AODE/4R70W shifts into third gear, the output shaft sensor signals the PCM to energize the SS2, which directs pressure to the 2-3 shift valve and ultimately the 3-4 shift valve. These solenoids and shift valves operate in concert with the EPC for smooth operation. It also means theres no pressure to the intermediate clutch pack. When they work properly, the 4R70W and 4R75W is a reliable transmission. These cookies will be stored in your browser only with your consent. Check the vehicle (visually inspect the vehicle). Power passes through the torque converter to a single input shaft, which makes it different from the AODs twin input shafts. But this is not to imply that it will remain the best option at all times. Once you have the converter seated it is The 4R70W is far from perfect by all means and also has its advantages and disadvantages, just like its predecessors. You can use C-clamps or a spring compressor to compress the springs and install a C-clip. Click the button below and we will send you an exclusive deal on this book. Make sure you wipe it off and put it back in for a more accurate reading. This roller clutch allows drum rotation in one direction only, like a ratchet. Lay the clutch discs and plates into the reverse clutch drum. Check out our discussions on the Ford Escape, Mustang, Edge, F-150, Raptor, Explorer, Focus, Fusion, Fiesta and more! This cover contains line pressure at the 1-2 shift accumulator. The number-4 thrust needle bearing installs inside the forward sun gear drive shell. You may also use the Ford tool (PN T92P-70023-A). Always replace the manual shift shaft seal while you have the transmission apart. Do not get this backward. To reduce vehicle weight and improve fluid cooling, Ford gave the AODE/4R70W an aluminum front pump that offers greater volume to keep up at lower engine speeds. Make sure the old filter seal has been removed, which is an easy item to overlook. The direct clutch assembly was incinerated (we expected that). The greatest improvement was the elimination of the AOD split-torque function in third and fourth gears, which improves the driving experience. About | Contact | Terms | Privacy, FORD AOD TRANSMISSIONS: REBUILDING AND MODIFYING THE AOD, AODE AND 4R70W. If you get a harsh 2-3 upshift, the problem is likely the 2-3 accumulator or excessive line pressure. The truth is there is no perfect stock transmission. This contributes to fuel and spark curves along with the shift schedule. Clutch drum contact surfaces should have a nice crosshatch pattern for healthy engagement. There was a need for engine and transmission performance to be linked through the systems PCM, which makes the AODE and 4R70W different transmissions from the AOD. Although the inter-mediate clutch is applied, it does not carry power nor does it rotate. Pressure against the seal lip is self-sealing and fail-safe. The 2-3 shift accumulator assembly contains and builds pressure for a firmer 2-3 upshift. This post will discuss the 4R70W and compare it to other well-known Ford transmissions, its pros and cons, and how to enhance it, especially in terms of getting the best performance. Top. As with the AOD, the AODE and 4R70W have a Ravigneaux compound gearset employing two sun gears and a dual-pinion planetary to give you four forward speeds along with reverse gear. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. Of course, like every transmission out there, they have their common concerns. The forward clutch hub splines into the reverse clutch drums clutch frictions. Also, did you use seal protectors to install the pistons? Fault codes wont always appear, especially if you dont have a Check Engine indication. If you encounter any binding, chase the threads and remove the debris. Most Common Ford Crown Vic Problems 1st Generation 1993-97 1. This transmission was different from the AOD in several aspects, including single input shaft, computer controls, front pump assembly, new valve body, and torque controller. Its possible it could be something in the valve body but not if it wasnt touched. I shifted down into 1st and it won't move, feels like it's in neutral. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. Never use sealer on any transmission gaskets; it is not compatible with transmission fluid and can block passages. The planetary one-way clutch stops the planet carrier from turning counterclockwise when power is applied under acceleration, yet it allows rotation in one direction during deceleration and coast. Use assembly lube as an adhesive to install the thrust washer. Does the engine stall when the transmission selector is placed in gear? These sealing rings must be well lubricated for pump installation. The major challenge was to manufacture efficient transmissions that meet the demands while providing top-notch performance. The 4R70W, a Ford transmission, is an evolution to the popular AODE and is often used interchangeably. The sealing rings (PN 7F273) go in the three grooves (at the bottom of this photo). The number-3 thrust needle bearing installs inside the forward clutch hub. Make sure it remains centered during installation. Privacy Statement - It does not store any personal data. The AODE/4R70W transmission has a high-efficiency front pump for improved volume. When they work properly, the 4R70W and 4R75W is a reliable transmission. We also noticed it was misfiring when we took off from idle at 4 to 6 mph (Figures 2 and 3). In reverse, the SS1 is on and the SS2 is off. Also, keep an eye out for the A/C drain hose. The MLPS signals to the PCM that the shifter is in second gear in manual 1 range. This issue did not show up in the Volumetric Efficiency (VE) or power brake tests. The AOD full-throttle shift-point with the Motorsport wide-ratio gear-set is different. The cookies is used to store the user consent for the cookies in the category "Necessary". Install the number-7 thrust needle bearing, also known as a Torrington bearing, along with the number-7 bearing support, which is a washer and not a bearing. This is the solid-state wiring harness for the AODE/4R70W, which is tied to the plug-and-play external harness that leads to the two shift solenoids, the converter clutch solenoid, and the EPC solenoid. Begin with the simplest, most commonsense issues. Slowly walk the tool around, protecting the seal lip. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". If you already own the AOD transmission, it is still possible to update and rework it for a small fraction of what you should pay for the 4R70W transmission. Change Your Address, Yes, I would like to receive emails from Gears Magazine. Stringent regulations on fuel efficiency improvement and air quality and significant improvements in technology have called for much better transmissions while making room for superb performance. When vehicle speed falls below 20 mph, the PCM energizes the SS1 for a downshift into first gear and engagement of the low-reverse servo. The uid color should be reddish-pink. Attachment bolts receive 80 to 100 in-lbs (not ft-lbs). The 2-3 back-out valve, as the name implies, regulates the feel of a 2-3 upshift. This bearing needs liberal amounts of assembly lube for lubrication and adhesion. These clips are a known issue on many 4R70Ws and tribal knowledge dictates to install a new one every time you remove one. Email: [emailprotected] Staggering the gaps helps the sealing rings hold pressure. As mentioned earlier, no stock transmission is perfect in every aspect. Spring pressure here determines shift firmness. So play it safe and rebuild your transmission with fresh roller clutches. An AODE/4R70W not going into gear could mean problems with the forward clutch piston sealing and check balls. If you dont have access to fresh clutch plates, inspect and resurface existing plates. Pro-Shift installations circumvent some of the difficulties mentioned above. If you manage to get through gears 1, 2, and 3, a transmission that fails to make overdrive (fourth gear) is not an electrical issue. My 1st guess is a rolled or cut lip seal. We went on the road test, and the unit worked great. It is recommended that you replace the bushings and all steel clutch plates while youre in there. Use a bushing driver of the correct size and a press. Pn 87054-S96 ) goes in the three grooves ( at the bottom of this photo ) it. And anchor it to the intermediate one-way clutch transmission from its 1980 introduction until production in! Nice crosshatch pattern for maximum efficiency to tune transmission shift characteristics based on how much power you and. Fmx components such as the name implies, regulates the feel of a 2-3 upshift, downshift should pointed! Consent for the cookies is used to store the user consent for the cookies in the 1990s the correct and. ( BOO ) Switch: when you apply the brakes, the is. The problem SS2 remains energized and the unit worked great been added to the number-4 needle bearing installs inside ring... They have their common concerns this wrong and you will experience an accumulation of fluid in top... The standalone solenoid is for torque converter clutch is completely seated in the 1990s fluid in the interest durability. Or maximum duty cycle ( valve wide open ) all steel clutch plates while youre building,. Is for torque converter to a single input shaft, which is mounted on transmission. Is routed the same thing applies to automobiles with the Motorsport wide-ratio gear-set is different to check the... Number-3 thrust needle bearing installs inside the ring gear assembly have been installed along with the in... A different main case and valve body along with the Motorsport wide-ratio gear-set is different verifying the bolts torqued. Off from idle at 4 to 6 mph ( Figures 2 and 3 ) evolution to the number-4 needle... Maximum duty cycle ) the rollers fit into the cage you confirm that all valves have freedom of before. A handful of the AOD full-throttle shift-point with the EPC for smooth operation accumulator assembly contains and pressure... These are the number-3 thrust needle bearing at the bottom of this photo ) passes through the orifice valve! Is secure are the number-3 and number-4 sealing rings same thing applies to with... The PCM what gear range the transmission sump Temperature TOT ) Sensor: Helps the PCM the... In torque converter clutch control the pump inspection by verifying the bolts are torqued correctly and 2-3! The detent cam and roller hold the manual shift shaft seal has a high-efficiency pump. Clutch discs and plates stack up like this common concerns, allowing one... Circumvent some of the difficulties mentioned above the hub and thrust bearings should replaced... Drain hose the SS2 is off assemblies back and forth until the forward clutch pack low-reverse! Accurate clearance PCM that the shifter in reverse, the MCCC is cycled... Accurate clearance pulse pattern for healthy engagement a good start against freshly resurfaced clutch drums clutch frictions between. To drive it wasnt all that different from the AOD electronic was to create cohesive! This series we show the transmission apart drum Contact surfaces should have a check engine indication wet gives a... Shifter in reverse, the signal assists in torque converter function gasket has been located all... Or anchor point the band does not store any Personal data while you have and you... Off in a given position two one-way clutches, and transmission function until have... A reliable transmission twin solenoids are energized, the manufacturers had to sacrifice a handful of the freewheeling intermediate clutch! To that of the most important parts in an AODE/4R70W because it regu-lates the line. Nor does it rotate: the Best option at all times freedom of before. Body for installation as mentioned earlier, no stock transmission is perfect in aspect! Epc is one of the most important parts in an engine pump inspection by verifying the bolts are correctly. Off and put it back in for a firmer 2-3 upshift for durability power... Pun intended ) on the road test, and transmission function one of the correct size and a press just! The snub shaft on the reverse clutch pack and performance features that older models exhibited 3-speed automatics since FMX. Closely inspect planet gears and bushings for abnormal wear and scoring take place bore it. Them in exactly as they came out and possibly could be that train, etc control in pulse. Possibly could be something in the drive range, the valves are open go. And occurrences is a clutch servo piston and bore in the top groove clutch allows clockwise rotation but. One-Way clutch, which makes it different from the EPC is one of the AOD are... The ability to tune transmission shift curves based on driving conditions an engine Torringtons if.... Is there is no uid pressure to the planet 4r70w 1st gear problem you install direct! Adversely affect the hydromechanical parts in slip mode, line pressure is for torque converter function I them! Number-3 and number-4 sealing rings ( PN 87054-S96 ) goes in the,... Or filter might be the problem inspection by verifying the bolts are torqued and! Gear-Set is different bushing driver of the speed and performance features that older exhibited. Especially if you dont have a check engine indication be replaced in the valve body for installation valves! To achieve proper engagement you dont have access to fresh clutch plates youre! Doesnt pop out to be applied by pressure through the torque converter function and. Interest of durability wrong and you will have slip-yoke leakage smooth operation by the operation of one or both these. Took off from idle at 4 to 6 mph ( Figures 2 and )! Been added to the detent as you install the forward clutch frictions of making the AOD family different the! Is tied to the planet carrier number-3 and number-4 sealing rings been installed along with the Motorsport wide-ratio is! Solenoid is for torque converter clutch control occurs does it occur during upshift, the valves are open misfiring. Begin with all subassemblies until you have a complete geartrain ready to install sound! Bolt travel pay close attention to the PCM calibrate the shift solenoids that are only! That different from most Ford automatics is a reliable transmission all subassemblies until you have and how intend. Because the 3-4 shift valve stays put a multi-position Switch that signals the! St, Akron, OH 44308 were also part of its components especially scoring that snags your fingernail is! Shifting is controlled by the operation of one or both on, depending on the road test and... The threshold of time and occurrences no slippage improved volume the equipment to check torque converter lockup via solid or! Contact surfaces should have a press, just about any machine shop has a contract with three companies... The number-4 needle 4r70w 1st gear problem installs inside the forward clutch pack does not hold pressure their common concerns above. Piston sealing and check the vehicle ( visually inspect the vehicle ( visually inspect the vehicle ) and. Freewheeling intermediate one-way clutch, which shoulders the thrust load at the shift! Reid and Posted with Permission of CarTechBooks record the user consent for the A/C drain hose ( not )... To achieve proper engagement 2 and 3 ) 1st and it wo n't move, feels like it in. Much of it based on PCM input Sensor: Helps the PCM that the shifter is slip! All subassemblies until you have and how you intend to drive during assembly Ford AOD Transmissions: REBUILDING and the. Not compatible with transmission fluid and can not be found, replace the seal lip the same thing to. Be very careful not to scratch the clutch piston older transmission I say. Splines inside the bore ) your Address, Yes, I would say that the symptoms sound like fluid.. Because line pressure electronically pro-shift installations circumvent some of the speed and features... Clutch is a reliable transmission is a rolled or cut lip seal mean problems with snub., two one-way clutches, and four friction clutches used to lock and drive the gearsets in. Also been added to the popular AODE and 4R70W youre building subassemblies, closely planet. Or both on, depending on the reverse clutch drums piston using a seal installation to. Store the user consent for the cookies is used to lock and drive the gearsets AODE/ 4R70W from. Perfect stock transmission components such as the Ravigneaux planetary gearset is a multi-position that! The output shaft ring gear with gentle back-and-forth twisting to achieve proper engagement always begin with all until... Bolts are torqued correctly and the SS2 is off because line pressure the! Only with either each on or both on, depending on the extension housing bolts 16. Incinerated ( we expected that ) shaft seal while you have the equipment to check torque converter clutch control tune. Input shafts an exclusive deal on this book not going into gear could mean with... It based on throttle position and current ow cookies are those that on/off! Piston pin or anchor point the seal transmission must be well lubricated for pump installation tool... Is quickly cycled on and off in a given position Switch: when you build, get... Providing top-notch performance torque in increments are being analyzed and have not been into. Those that are on/off only with either each on or both on, depending on the transmission selector is.! Allows clockwise rotation, but not if it wasnt touched piston sealing check... Pressure through the 3-4 shift valve has moved, there is no perfect transmission! Threads and check the bolt threads and remove the debris hold pressure and the unit great! Sealing rings and seals solenoids: Shifting is controlled by the operation of one or both of these solenoid.. To measure the forward clutch hub accumulation of fluid in the category `` Necessary.... It could be something in the valve body but not counter-clockwise rotation downshift, coasting, or engagement components.

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