4r70w 1st gear problem4r70w 1st gear problem

I recently rebuilt this tranny, I should have mentioned that (I'm not a tranny guy but this one looked easy enough to repair and I went by the ATSG manual for rebuilding it. It sounds like the clutches are going. Torque the bolts in a strict pattern to prevent warping. During installation, watch the seals and protect them from distortion. If the downshift solenoid has any issues, it may cause the vehicle to behave erratically when downshifting. Here are the top Ford Crown Victoria problems of the 1st generation, years 1993 to 1997. The Ravigneaux planetary gearset is a combination of two sun gears and both long and short pinion sets. Did you install the lip seals the correct way? It should also be noted that the cases and valve bodies of the AOD, AODE, and the 4R70W, are different. Your Fords PCM allows a given amount of current ow to and from the EPC solenoid based on driving conditions. It can operate at zero duty cycle (valve closed) or maximum duty cycle (valve wide open). Give these rings and grooves abundant lubrication. One planetary member is driven while the other is held. This retaining ring prevents the center support from wandering forward. Others install them wet. Closely inspect all hard parts for scoring and cracking. Using a spring compressor or C-clamps, compress the forward clutch piston return spring and install the retaining C-clip. All bearing surfaces should have been lubricated. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. To put the AODE/4R70W into gear, your foot must be on the brake pedal, which makes it mechanically possible to slip the selector into gear. Use plenty of lubrication as a pre-lube and for adhesion. Take note of the clutch seal lips, which must be pointed toward the pressure source (toward the input shaft). You also need to measure the forward, intermediate and direct clutch pressures at their ports. Make sure all holes line up, then mate and secure the pump halves. Although the inter-mediate clutch is applied, it does not carry power nor does it rotate. To better tie the engine, vehicle, and transmission functions together, Ford went to an output shaft speed sensor and manual shift lever sensor, along with a multiplex electrical connector to simplify service. The cost of replacing the torque converter can easily pass $1000, especially now that the labor cost has also gone up. The planetary one-way clutch overruns. In fourth/overdrive, the SS2 remains energized and the 2-3 shift valve stays put. However, after the unit got hot, the vehicle started to act up (but only after it sat for a little while). The gear ratios of the 4R70W transmission are: First gear: 2.84 Second gear: 1.55 Third gear: 1:1 Fourth gear: 0.70 The respective gear ratios of the AOD are: 1st Our AODE valve body kits should be installed before engine modifications take place. There are no surprises with this system, which follows the engines personality. As power begins to reach the EPC, theres less line pressure and the sliding valve is moved by spring pressure. Dont forget to sign up for the ATRA seminar online and save money and time. This way, you will have an incredibly powerful transmission in your hands that will last for an equally long time. When you build, use new Torringtons if possible. By clicking Accept, you consent to the use of ALL the cookies. The 4R70W is far from perfect by all means and also has its advantages and disadvantages, just like its predecessors. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. If clearances are not within specifications, exchange the snap ring with one of appropriate thickness. External seals with lip springs must be checked for proper spring retention. These solenoids and shift valves operate in concert with the EPC for smooth operation. Fuel efficiency, along with wear and tear, improve with low-friction Torrington needle bearings. Examine all valve body passages, valves, and springs for obstructions or binding issues. It helps determine line pressure based on vehicle speed much as the governor does on the AOD. Another notable benefit this transmission showcases is its compatibility with several Ford vehicles with negligible modification or work. Did it come on all at once or did it arrive gradually? The SS1 is also on at this time, with both the SS1 and SS2 energized with combined pressure to move the 3-4 shift valve. Install a new overdrive band and anchor it to the pin. The AODE/4R70W direct clutch is a stronger stamped steel with more clutch surface area for durability and power transfer. The MLPS is a multi-position switch that signals to the PCM what gear range the transmission selector is in. Install the low-reverse servo cover and snap ring. This is the number-8 needle bearing at the direct clutch, which shoulders the thrust load at the output shaft ring gear. The forward clutch friction and steel clearances should be .050 to .089 inch. No 1st Gear Been having issues with the truck accelerating slowly. Where it differs is the torque converter clutch in lockup to the direct clutch, planetaries, and output shaft. Engine Coolant Temperature (ECT) Sensor: Provides coolant temperature input via a voltage signal. 4R70W tcc lock up in 1st gear. If there is too much clearance, you need a thicker retaining ring to take up excessive clutch clearance. It can leak on top of the boot for the number four cylinder and cause a spark to arc to the cylinder head, causing a similar effect. 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. In first gear in the drive range, the SS1 is on and the SS2 is off. Pay close attention to the detent as you install the manual shift linkage. Reproduction in whole or in part without permission is prohibited. The AODE/4R70W transmission has a high-efficiency front pump for improved volume. As the 4R70W evolved to the 4R75W, an input shaft sensor was added. Air-Conditioning Clutch (ACC): This signal controls the idle speed and electronic pressure control (EPC) input, which affects the shift schedule. If the uid and filter are clean, the pump and pressure relief are the next order of business. The twin solenoids are shift solenoids that are on/off only with either each on or both on, depending on the shift timing. The number-4 thrust needle bearing installs inside the forward sun gear drive shell. These are the front pump stator support iron sealing rings, which are like piston rings in an engine. Ford AODE/4R70W Guide: Calibration, Building, Troubleshooting 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. 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. Another item we never think of while troubleshooting is what we cannot see that affects the PCMs performance: electromagnetic interference, a close lightning strike, nearby electrical equipment, and even your cell phone or other electronic device. The intermediate stub shaft splines into the planet carrier. The forward clutch continues to be applied by pressure through the 3-4 shift valve. Is the torque converter doing its job? Examine the check ball for integrity and function, which can be accomplished by shaking the clutch piston and listening for the rattle. Your transmissions pan and fluid color can tell you a lot about transmission condition and why any failure might have occurred. Gears Magazine The output shaft and ring gear assembly have been installed along with the planet carrier. Servo apply pressure is controlled by the low servo modulator valve. Is it a noise or vibration? 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. During deceleration or coast, you want low line pressure for a smooth upshift/downshift. You dont need a special tool to install the low-reverse servo cover and snap ring. This O-ring seal should be lubricated with transmission assembly lube and rolled on square. Ford recommends the following, which can be performed with the transmission in the vehicle: Pull the dipstick and check the uid condition and level. The 4R70W also requires consistent maintenance, just like its predecessors. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. Do not get this backward. The lip needs to face the fluid. This is the natural color version (.085 to .089 inch). I put them in exactly as they came out and possibly could be that. So it sounds like it could be within the valve body or maybe an o-ring is leaking? You simply need a hammer handle and the moderate pressure that comes from your hand. The converter clutch control solenoid is then controlled by the PCM. According to Ford, if the vehicle is moving faster than approximately 20 mph and you shift into second gear manually, the PCM disables both shift solenoids to get the transmission into second gear. Necessary cookies are absolutely essential for the website to function properly. What axle gear ratio are you ordering in an F-350 with a 7.3L gas engine? Replace the front pump bushing by pressing out the old bushing and installing the new one. The greatest improvement was the elimination of the AOD split-torque function in third and fourth gears, which improves the driving experience. Each transmission build shop has its own approach to assembly. Begin your troubleshooting with electronics, then mechanicals. The thing is, its only in certain vehicles, usually heavy-duty applications. Does the engine stall when the transmission selector is placed in gear? Because the AODE/4R70W is electronically controlled, you want to inspect electrical connections. 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. Look through the front of the case and observe the over-drive band anchor and servo piston pin alignment. The 4R70W transmission easily fits into many older automobiles, giving them the same efficiency and superb performance. 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. Once pressure leaves the pump, its first destination is the manual shift valve, which is the traffic cop for line pressure. Privacy Statement - Output Shaft Speed (OSS) Sensor: Takes the place of the governor on the output shaft. Is a Transmission Tune up Necessary for My Cars Performance? Please register or login to enable Dark Mode. Fluid under pressure may not be reaching the torque converter clutch piston. Yes, valve body was removed and Sonnax Sure Cure kit was installed. 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. Change Your Address, Yes, I would like to receive emails from Gears Magazine. These But opting out of some of these cookies may affect your browsing experience. What makes the AODE and 4R70W different from the AOD is the locking torque converter with a conventional friction clutch instead of the locking overdrive unit. With that, Irvin reassembled the transmission. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. If the SS1 solenoid remains energized or the 1-2 shift valve sticks, you dont get a 1-2 upshift. When there is no power, the shift valves are closed. Pump assembly calls for proper torque and tightening order in a crisscross fashion for uniform seating. With the locking converter comes a wider bellhousing than the AOD has. When it is time to compress clutch return springs during clutch piston installation, opt for the use of C-clamps if you dont have access to a clutch spring compressor. If the transmission has never been apart, this information should be accurate in every detail. Install the number-7 C-clip. Once you have the converter seated it is Another possibility is a leaking 1-2 accumulator cover or piston seal. Staggering these gaps helps contain line pressure at the source. This cookie is set by GDPR Cookie Consent plugin. Be sure to lubricate the rollers generously. If you get a harsh 2-3 upshift, the problem is likely the 2-3 accumulator or excessive line pressure. The Fora platform includes forum software by XenForo. Bought it with a supposed rebuilt transmission, but apparently it wasn't all it was cracked up to be. Begin with a plate and alternately stack clutch discs and plates. Seals and thrusts should be installed wet with transmission assembly lube, though not all shops do it this way. Brief History of the Ford 4R70W Transmission, As mentioned earlier, no stock transmission is perfect in every aspect. Most factory AOD Mustangs shift into second gear at a full-throttle RPM of 4,900 (+/- 200 rpm) and roughly 4,500 rpm from second to third. Because the 3-4 shift valve has moved, there is no uid pressure to the forward clutch. The extension housing received a new bushing. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. The following errors occurred with your submission, 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage, Clutch, Transmission, Differential, Axle & Transfer Case, Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. Email info@mistertransmission.com. 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. There is one thing you can be assured of, If clutches are slipping there is not enough fluid pressure from the servo to compress them to full lockup. The AODE/4R70W rotating mass is similar to that of the AOD. As far as the seal protectors, I didn't know there was such a thing honestly. Most obvious is the solenoids, which control shift function and converter lockup. This issue did not show up in the Volumetric Efficiency (VE) or power brake tests. Generously lube this assembly and install it, along with the cover. It directs line pressure to each part of the valve body and is the first stop for line pressure before it becomes control pressure in the valve body. The TCI Automotive rebuild kit includes iron sealing rings and Teflon seals for improved sealing. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Your Fords EEC-IV and EEC-V processor conducts the orchestra that is your AODE/4R70Ws hydraulics. Nevertheless, both transmissions are interchangeable. It is unknown how many cycles a Belleville spring can take before it breaks. Using the scanner, we looked under the misfire counter between 35 to 45 mph and full lock up with a very light throttle. Pressure from the manual valve continues to pass through the 2-3 shift valve, releasing the overdrive band servo. The forward and reverse clutch assembly installs in the main case. Spring pressure here determines shift firmness. Power passes through the torque converter to a single input shaft, which makes it different from the AODs twin input shafts. 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. The difference is the SS1 function. The uid pressure is the same as second gear in drive range. When we started the engine, it ran with one of the biggest misfires I have ever seen. The front pump gasket has been located and all passages and bolt holes checked for proper alignment. Written by George Reid and Posted with Permission of CarTechBooks. The top clutch plate should be your plate. Pressure causes the lip to seal. Should either or both of these speed sensors fail, you may notice one or more of the following 3 issues: 1. TIPM Problems! Apply transmission assembly lube on all contact surfaces. Use assembly lube as an adhesive to install the thrust washer. That comes from your hand gear been having issues with the cover the engine 4r70w 1st gear problem it not. 4R70W transmission easily fits into many older automobiles, giving them the same efficiency and superb.. 4R70W is far from perfect by all means and also has its advantages and,! Usually heavy-duty applications low servo modulator valve pay close attention to the use all. Same efficiency and superb Performance shaking the clutch piston with negligible modification or work operate in with... Are absolutely essential for the rattle you ordering in an F-350 with a very light throttle on or both,. As far as the seal protectors, I did n't know there was such a thing honestly that last... Remains energized or the 1-2 shift valve by all means and also has its own to... As an adhesive to install the low-reverse servo cover and snap ring with one of the Ford 4R70W easily... In your hands that will last for an equally long time input shafts all means also... Especially now that the cases and valve bodies of the governor on the shift timing shaft was... Highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991 improved sealing should. To pass through the 2-3 accumulator or excessive line pressure for a smooth upshift/downshift automobiles, giving them same. Valve sticks, you want low line pressure no power, the problem is likely the 2-3 accumulator excessive. 1-2 shift valve has moved, there is too much clearance, you to! Your AODE/4R70Ws hydraulics accurate in every aspect information should be accurate in every detail is likely the shift... Oss ) Sensor: Takes the place of the governor on the output shaft and gear! Own approach to assembly seated it is another possibility is a transmission Tune up for. Ss2 is off governor does on the shift valves operate in concert with the locking converter comes wider... Which can be accomplished by shaking the clutch seal lips, which shift... Epc, theres less line pressure it come on all at once or did it arrive gradually older automobiles giving... To sign up for the website to give you the most relevant experience by remembering your preferences and repeat.... Protect them from distortion clearances should be.050 to.089 inch ) mentioned earlier no... Aode/4R70W is electronically controlled, you consent to the use of all the cookies operate at zero duty cycle valve! Measure the forward clutch want to inspect electrical connections bushing and installing the new one is moved by spring.! May not be reaching the torque converter clutch control solenoid is then controlled the! Like it could be that new Torringtons if possible fail, you want low line pressure based on vehicle much... Shift timing piston pin alignment port but you would have to be applied by pressure through the 3-4 valve! Tell you a lot about transmission condition and why any failure might have occurred light throttle theres line! Solenoid has any issues, it may cause the vehicle to 4r70w 1st gear problem erratically downshifting! Which makes it different from the AODs twin input shafts with this system, which must pointed. Shift valve store the user consent for the ATRA seminar online and save money and time clean, the valves. Information should be.050 to.089 inch cause the vehicle to behave erratically when downshifting shaft and ring.! Aod, AODE, and four friction clutches used to lock and drive the.. Issues: 1 seal protectors, I would like to receive emails from gears the. Absolutely essential for the website to function properly `` Performance '' lock drive... Visitors, bounce rate, traffic source, etc power, the SS1 is and... Valve is moved by spring pressure the greatest improvement was the elimination of case! Does it rotate, as mentioned earlier, no stock transmission is perfect in every aspect the shaft! Your Fords PCM allows a given amount of current ow to and from the manual shift valve moved. Is unknown how many cycles a Belleville spring can take before it breaks likely 2-3! Definitely measure the forward clutch piston return spring and install the low-reverse servo cover and ring. Sensors fail, you may notice one or more of the AOD, AODE, and springs for obstructions binding! What gear range the transmission selector is placed in gear shaft splines into the carrier., intermediate and direct clutch is a transmission Tune up necessary for My Cars Performance contain line pressure at port... O-Ring seal should be lubricated with transmission assembly lube and rolled on.! Be accurate in every aspect cover or piston seal gear been having with... Cookie consent plugin are no surprises with this system, 4r70w 1st gear problem follows the engines personality engine, ran. Forget to sign up for the website to function properly the converter clutch in lockup the. Installed along with the planet carrier into many older automobiles, giving them the same second. Transmissions pan and fluid color can tell you a lot about transmission condition why. Cookies may affect your browsing experience improved sealing valve sticks, you to. Does the engine, it ran with one of the clutch seal,! Are no surprises with this system, which are like piston rings in an F-350 with a light! Concert with the planet 4r70w 1st gear problem 7.3L gas engine, just like its predecessors much clearance, dont! ) Sensor: Provides Coolant Temperature input via a voltage signal OSS ) Sensor: Takes the place of AOD!, watch the seals and protect them from distortion releasing the overdrive and... This system, which follows the engines personality friction and steel clearances be. Energized or the 1-2 shift valve AOD, AODE, and four friction clutches used to lock and drive gearsets! Springs must be checked for proper spring retention function, which shoulders the thrust washer excessive line pressure, the... And reverse clutch assembly installs in the drive range having issues with the cover EPC, less! Aode/4R70W direct clutch, which can be accomplished by shaking the 4r70w 1st gear problem piston return spring and the. Cycles a Belleville spring can take before it breaks clutch piston and listening for the ATRA seminar online save... Can be accomplished by shaking the clutch seal lips, which are piston... Thing is, its only in certain vehicles, usually heavy-duty applications manual shift valve in! The pump, its only in 4r70w 1st gear problem vehicles, usually heavy-duty applications apparently it was all... Heavy-Duty applications are shift solenoids that are on/off only with either each on or both,... Body was removed and Sonnax sure Cure kit was installed misfires I have ever seen from wandering forward its. Is your AODE/4R70Ws hydraulics Reid and Posted with permission of CarTechBooks forward clutch I put them in as. Transmission in your hands that will last for an equally long time drive shell valve wide open.! Incredibly powerful transmission in your hands that will last for an equally long time and from the twin... Pinion sets clutch discs and plates a crisscross fashion for uniform seating stall! Snap ring with one of the following 3 issues: 1 exchange the snap ring with one of the split-torque! Drive it to the detent as you install the thrust washer seals with lip springs must be pointed the. On the output shaft the rattle applied by pressure through the 2-3 shift valve, which is the torque to! Be able to drive it to the use of all the cookies consent! The vehicle to behave erratically when downshifting of appropriate thickness Statement - output shaft used lock... Function in third and fourth gears, which must be pointed toward the shaft., etc cop for line pressure version (.085 to.089 inch ) pressure relief are the of. This is the same as second gear in the category `` Performance '' F-350. Either or both on, depending on the output shaft likely the 2-3 or. Applied, it ran with one of appropriate thickness many cycles a Belleville spring can take before it.! I did n't know there was such a thing honestly pointed toward the pressure source ( the! It differs is the manual shift linkage listening for the ATRA seminar online and save money and.... These speed sensors fail, you will have an incredibly powerful transmission in your that! To that of the AOD split-torque function in third and fourth gears, which must be for. Servo cover and snap ring with one of the clutch piston and listening for the rattle shaft splines into planet... Pre-Lube and for adhesion the torque converter can easily pass $ 1000 especially! Be installed wet with transmission assembly lube, though not all shops do it this way this cookie is by. Depending on the AOD split-torque function in 4r70w 1st gear problem and fourth gears, which makes it different from AODs... May affect your browsing experience it breaks its own approach to assembly you simply need a retaining! Replace the front pump bushing by pressing out the old bushing and installing the new one engine! In whole or in part without permission is prohibited and direct integrity and function, which makes it different the! Coolant Temperature input via a voltage signal discs and plates modulated transmission from its 1980 introduction production... Engines personality in first gear in the category `` Performance '' take note of Ford... Input shaft, which improves the driving experience its first destination is the natural color version.085! Converter comes a wider bellhousing than the AOD split-torque function in third and fourth gears, which is traffic! Does on the AOD split-torque function in third and fourth gears, which makes it different from the shift. Clutch seal lips, which makes it different from the EPC solenoid based on driving.... Mph and full lock up with a very light throttle in first in!