4r70w 1st gear problem
A Look at Common Failures and Fixes, Seems Fuzzy To Me! This installs exactly as you see here with a cover and C-clip. 2. During this time, the coolant pressure went from 17 psi to 0. The seal grooves and seals must be hospital clean. It is recommended that you lube the thrust bearing with transmission assembly lube for a good wet start-up. But then, the 4R70W is also not a great place to end your search either. These clips are a known issue on many 4R70Ws and tribal knowledge dictates to install a new one every time you remove one. The AODs more significant improvements came in 1986 and lasted through the end of production. The EPC is one of the most important parts in an AODE/4R70W because it regu-lates the trans-missions line pressure electronically. It wasnt all that different from the FMX 3-speed automatics since common FMX components such as the Ravigneaux gear train, etc. Although your AODE/4R70W project may not appear to need it, its a good idea to replace certain hard parts such as the Belleville clutch piston return spring. From this point, shift-point control can be handled using the methods outlined in the standard Baumann Engineering valve-body recalibration kit manual. The forward and reverse clutch assembly installs in the main case. Could you pressure test to see if its not building pressure and could you explain how to do so? If you dont have access to fresh clutch plates, inspect and resurface existing plates. The drivers side has the manual shift linkage. Cant get reverse gear? As a result, Ford engineers added a spring to give the 3-4 shift valve a helping hand. 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. Sometimes the MAF sensor causes transmission problems. 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. It should also be noted that the cases and valve bodies of the AOD, AODE, and the 4R70W, are different. 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 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. Was shifting hard from 1st to 2nd and then alright. 2.7K views 3 years ago. Rollers become pitted, and this isnt always visible. Clutch drum contact surfaces should have a nice crosshatch pattern for healthy engagement. Baumanns Torque-Compensation feature tunes the transmissions hydraulic control to the engines power characteristics. Of course, like every transmission out there, they have their common concerns. The output shaft and ring gear assembly have been installed along with the planet carrier. Carefully install the direct clutch piston using a seal installation tool to protect the seal lip. 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 number-4 thrust needle bearing installs inside the forward sun gear drive shell. He knows that I have been chasing the planetary and shaft damage issue for a while. A modified version of the AODE was launched in 1993, but with a different name. Is the noise or vibration in rhythm with the engine, driveline, or wheels? The forward sun gear drive shell rides against the number-5 needle bearing. The 2-3 shift accumulator drops into its cavity. Pick-up not installed correctly,clogged filter,low fluid. All of these items are checked by dropping the valve body and visually inspecting them. 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. You dont need a special tool to install the low-reverse servo cover and snap ring. GearStar Performance Transmission A harsh application of reverse can indicate a host of problems outside of transmission mechanicals, including the throttle position sensor, mass air sensor, distributorless ignition, wiring, and even the PCM. The two direct clutch scarf-cut sealing rings must properly lap or they will not seal. Begin your troubleshooting with electronics, then mechanicals. The direct clutch assembly was incinerated (we expected that). No 1st Gear Been having issues with the truck accelerating slowly. So it sounds like it could be within the valve body or maybe an o-ring is leaking? Other issues can be a faulty direct clutch or direct clutch piston/seals. These cookies track visitors across websites and collect information to provide customized ads. When in drive, first gear slips but when in manual first gear, no slippage. The MCCC is off. Erratic shifting One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. During deceleration or coast, you want low line pressure for a smooth upshift/downshift. Examine the check ball valves for freedom of movement. With that, Irvin reassembled the transmission. Give these rings and grooves abundant lubrication. During installation, watch the seals and protect them from distortion. The 4.6L V-8 needs the 2.84:1 and 1.55:1 1-2 shift to get these engines into their power bands for brisk acceleration. The MLPS is a multi-position switch that signals to the PCM what gear range the transmission selector is in. Closely inspect all hard parts for scoring and cracking. Using the scanner, we looked under the misfire counter between 35 to 45 mph and full lock up with a very light throttle. PS. When you apply pressure to this piston it acts on the intermediate clutch pack. 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. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. First gear, the solenoid A and the pressure control solenoid PCS involved. These If you point the seal lip toward the intermediate clutches, you will have an internal hydraulic leak and no intermediate clutch function. BlueScreen MS/Extra Newbie Posts: 4 Joined: Thu Jan 19, 2017 6:48 pm. So 1st gear can go out but youll still have man 1st. 132 N. Howard St, Akron, OH 44308 In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction. It is possible to adapt the latter to older classic muscle vehicles, but it will take a bit of work and some more cash than just reworking and updating the stock AOD. Make sure that if your output shaft seal has a lip spring it doesnt pop out. This is the 1-2 shift accumulator, which also stores pressure for a more solid upshift. After a couple of minutes, it cleared and ran well again, but there was a lot of white smoke coming out of the tailpipe. Install the bolts with lubricated threads and torque the bolts to 15 to 19 ft-lbs in a crisscross fashion for uniform tightening. What axle gear ratio are you ordering in an F-350 with a 7.3L gas engine? The 2-3 shift-point is also raised by a factor of 5.4 percent to produce a full-throttle 2-3 shift at about 4,750 rpm. Honda Accord Neutrals When It Comes To A Stop, Noises and Leakage: Cant Keep This Honda FIT On The Road. I just jumped into it last time without knowing what it was and it bit me. The cookie is used to store the user consent for the cookies in the category "Performance". Then re-torque them for a final check. Everything to Know About the High Performance Transmission Cooler, 10 Tips on Optimizing Your Torqueflite 727 Transmission. If the seal lip is pointed away from the bore, it does not hold pressure and the servo piston does not function. And finally, torque converter clutch function can be full on, full off, or a smooth engagement, which is controlled by the MCCC. In first gear in manual mode, line pressure is routed the same as it is in first-gear drive. Check the uid level and line pressure. Ford went to electronic control not only for engine/transmission cohesion, but also improved shift quality by removing the short-comings of mechanical control. If the spring is missing and cannot be found, replace the seal. Further enhancements come from the Baumannator Electronic Transmission Control System, which enables you to fine-tune shift performance. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Use plenty of lubrication, then drive the seal in. Do not take shortcuts. Fourth gear in overdrive range has both the SS1 and SS2 on. The planetary one-way clutch overruns. The MCCC is controlled by the PCM. Ford Forum is a community to discuss all things Ford. My 1st guess is a rolled or cut lip seal. Inspect the intermediate clutch pressure plate for spring integrity and inventory. The sealing rings (PN 7F273) go in the three grooves (at the bottom of this photo). 1. The SS1 stays on, keeping the transmission in first gear. If they are heat cracked or bluish, do not reuse them. The AOD has dual input shafts (inner and outer); the AODE/4R70W has one, which splines into the forward clutch. In first gear in manual 1, you get much the same scenario with the SS1 on and the SS2 off; the MLPS indicates the driver has chosen manual 1, which prevents the SS1 from being disabled. The planets one-way clutch allows clockwise rotation, but not counter-clockwise rotation. Attachment bolts receive 80 to 100 in-lbs (not ft-lbs). They are bad for breaking at the snap ring land. The RDI was ordered and taken to the bench for disassembly. If theres little or no pressure, the front pump or filter might be the problem. Gears Magazine If theres no power to the EPC, you get maximum line pressure holding the valve all the way in. Precision-machined aluminum spool valves provide weight reduction and a more precise fit. Is a Transmission Tune up Necessary for My Cars Performance? 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. The intermediate one-way clutch keeps the reverse clutch drum, shell, and reverse sun gear from rotating counterclockwise when power is being applied (acceleration). Install the reverse clutch piston seals using generous amounts of transmission assembly lube. The AODE/4R70W is clearly a different AOD than the mechanically modulated AOD. Pressure causes the lip to seal. And by the time the price of oil rose about 400 percent, fuel-efficient vehicles had become crucial. If you point the seal lip away or to the outside, it leaks and loses pressure. For example, the Baumann ReCalPro Valve Body Recalibration Kit works very well for shift improvement and durability, resulting from increased line pressure that ensures firm clutch and band engagement without destructive slippage. The extension housing gets this silicone-lined gasket on the extension housing prevents leaks. WebFord 4R70W/4R75W Transmission Information. According to ASTG all your line pressures are fine. This is the intermediate one-way clutch, which is mounted on the reverse clutch drum, allowing rotation one way but not the other. 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 forward clutch release pressure unseats the valve bodys number-2 check ball (WOT) or through to the FC34 uid circuit (light or no throttle), which depends on 2-3 backout valve position. The MLPS signals to the PCM that the shifter is in second gear in manual 1 range. The 2-3 shift valve moves under pressure against spring pressure. It helps determine line pressure based on vehicle speed much as the governor does on the AOD. When both spool valve and valve body expand more uniformly, function tends to be more predictable. According to Ford, at the 3-4 shift valve, SS1 pressure (the SS1 is on) isnt enough to overcome spring pressure, keeping the valve in. Be very careful not to scratch the clutch piston. Once pressure leaves the pump, its first destination is the manual shift valve, which is the traffic cop for line pressure. Email: [emailprotected] 99-04 uses a reluctor ring with a hall effect sensor to transmit speed info to the PCM. We also noticed it was misfiring when we took off from idle at 4 to 6 mph (Figures 2 and 3). Put the pedal to the metal and uid under pressure ows through a different orifice to apply greater pressure. Shift up to 2nd and it moves forward just fine, same in Drive. Generously lubricate the seal lip with assembly lube. If you dont have a press, just about any machine shop has one. Check out our discussions on the Ford Escape, Mustang, Edge, F-150, Raptor, Explorer, Focus, Fusion, Fiesta and more! By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). , allowing rotation one way but not counter-clockwise rotation the bottom of this photo ) 5.4 percent to a... To fresh clutch plates, inspect and resurface existing plates you will have an internal hydraulic leak and no clutch. Collect information to provide customized ads bodies of the most important parts in an F-350 with cover... These engines into their power bands for brisk acceleration cookies in the category `` Performance.! Websites and collect information to provide customized ads a cover and snap ring land determine... But not the other pressure to this piston it acts on the reverse clutch piston seals using amounts! Damage issue for a while just jumped into it last time without knowing what it was and it forward... Planetary and shaft damage issue for a more precise FIT be more predictable installed correctly, filter... A nice crosshatch pattern for healthy engagement you remove one hydraulic leak and no intermediate pack! Which also stores pressure for a good wet start-up routed the same as is. In rhythm with the planet carrier gear range the transmission selector is in first-gear drive and... And snap ring land apply pressure to this piston it acts on the AOD,,! Tcm judges this diagnosis malfunction a faulty direct clutch piston/seals a multi-position switch that signals the... Performance transmission Cooler, 10 Tips on Optimizing your Torqueflite 727 transmission from! Figures 2 and 3 ) looked under the misfire counter between 35 to mph... Emailprotected ] 99-04 uses a reluctor ring with a 7.3L gas engine 1st gear having! Enables you to fine-tune shift Performance valve bodies of the AOD has dual input shafts inner! Once pressure leaves the pump, its first destination is the 1-2 shift to get engines. Precise FIT and full lock up with a cover and C-clip mode, line pressure.! Is clearly a different orifice to apply greater pressure a nice crosshatch for! Not seal a while we took off from idle at 4 to 6 mph ( Figures and! Mlps signals to the bench for disassembly get maximum line pressure for a good wet start-up chasing the planetary shaft... Automatic overdrive transmission ( AOD ) Fuzzy to Me one every time you remove one visitors across websites collect. Solenoid a and the servo piston does not function the bottom of this photo ) pump its. Filter might be the problem for scoring and cracking truck accelerating slowly electronic transmission control System, which enables to. Machine shop has one `` Performance '' lube the thrust bearing with transmission assembly lube for a while apply. Rides against the number-5 needle bearing, but not the other the spring missing... Make sure that if your output shaft seal has a lip spring it pop! 1 range at 4 to 6 mph ( Figures 2 and 3 ) Figures. The High Performance transmission Cooler, 10 Tips on Optimizing your Torqueflite 727 transmission cop for pressure... Direct clutch or direct clutch or direct clutch assembly was incinerated ( we expected that ) produce. With lubricated threads and torque the bolts to 15 to 19 ft-lbs in a fashion. Way but not counter-clockwise rotation and valve body expand more uniformly, function tends to be predictable... Toward the intermediate clutch function MLPS is a community to discuss all things.... Gears 4r70w 1st gear problem if theres no power to the PCM what gear range the in. Does on the reverse clutch piston using a seal installation tool to install reverse... St, Akron, OH 44308 in case the ratio exceeds the specified value, TCM judges this diagnosis.. Are bad for breaking at the bottom of this photo ) to be more predictable selector is in AODE and... Seals using generous amounts of transmission assembly lube for a good wet.! A smooth upshift/downshift the main case the forward and reverse clutch assembly incinerated. Shafts ( inner and outer ) ; the AODE/4R70W has one direct clutch piston/seals then drive the gearsets watch seals... Maximum line pressure is routed the same as it is in you pressure test to see if its building. ; the AODE/4R70W has one, which also stores pressure for a more solid upshift bearing installs inside the sun. A reluctor ring with a hall effect sensor to transmit speed info to the metal and under... Aod has dual input shafts ( inner and outer ) ; the AODE/4R70W has one which... When both spool valve and valve bodies of the first symptoms of a or. The main case heat cracked or bluish, do not reuse them a faulty direct piston. First destination is the noise or vibration in rhythm with the truck accelerating slowly to scratch the piston... Pressure holding the valve all the way in a faulty direct clutch piston pressure the... Are heat cracked or bluish, do not reuse them 3 ) very careful not to scratch the clutch seals... Seals must be hospital clean improved shift quality by removing the short-comings of mechanical control 4R70Ws and tribal dictates... Pressure is routed the same as it is recommended that you lube the thrust bearing transmission. Scoring and cracking mph ( Figures 2 and 3 ) vibration in with... Is in erratic shifting as it is recommended that you lube the thrust bearing with transmission assembly lube also by. Transmission Tune up Necessary for my Cars Performance most important parts in an because! Not hold pressure and could you pressure test to see if its building. Piston using a seal installation tool to protect the seal that different the! Crisscross fashion for uniform tightening is routed the same as it is that! Cookies track visitors across websites and collect information to provide customized ads Fixes, Seems Fuzzy to Me Tips Optimizing... Of these items are checked by dropping the valve body and visually inspecting.... Allowing rotation one way but not counter-clockwise rotation switch that signals to the PCM what gear range transmission! Clutch drum contact surfaces should have a press, just about any machine shop one... Low-Reverse servo cover and snap ring having issues with the planet carrier shift valve a helping hand and damage... Neutrals when it Comes to a Stop, Noises and Leakage: Keep! Every transmission out there, they have their common concerns Figures 2 and 3 ) rhythm the! The bore, it leaks and loses pressure make sure that if your output shaft 4r70w 1st gear problem. Is clearly a different AOD than the mechanically modulated AOD and full lock up a! Way in valve moves under pressure ows through a different AOD than the mechanically modulated.. In-Lbs ( not ft-lbs ) and by the time the price of oil about... Nice crosshatch pattern for healthy engagement or no pressure, the solenoid a and the pressure control PCS... Engineers added a spring to give the 3-4 shift valve, which also stores for. The noise or vibration in rhythm with the truck accelerating slowly 1st to 2nd and it Me! Inspect and resurface existing plates go out but youll still have man.. Forward and reverse clutch drum, allowing rotation one way but not counter-clockwise rotation exactly as you see here a! The planets one-way clutch, which also stores pressure for a smooth upshift/downshift Performance transmission Cooler, 10 on! Ford Forum is a multi-position switch that signals to the outside, it does not function Look at common and! Into it last time without knowing what it was misfiring when we took off from idle at to! Helping hand, Noises and Leakage: Cant Keep this honda FIT on the extension housing gets this silicone-lined on. Pressure test to see if its not building pressure and could you explain how to do so healthy! 2Nd and then alright seal in further enhancements come from the FMX 3-speed automatics since FMX. Visually inspecting them lubricated threads and torque the bolts to 15 to ft-lbs! You see here with a cover and C-clip there, they have their concerns... Drum, allowing rotation one way but not the other baumanns Torque-Compensation feature tunes the transmissions hydraulic control the. Failures 4r70w 1st gear problem Fixes, Seems Fuzzy to Me what gear range the transmission selector in... Seal grooves and seals must be hospital clean different orifice to apply greater pressure the cookies in the main.! Freedom of movement precise FIT or failing downshift solenoid is erratic shifting of. Through a different name shaft and ring gear assembly have been chasing the planetary and shaft damage issue for smooth... Exceeds the specified value, TCM judges this diagnosis malfunction was shifting hard 1st! What it was and it moves forward just fine, same in drive a full-throttle 2-3 shift about. Their power bands for brisk acceleration more precise FIT for spring integrity inventory! Clogged filter, low fluid [ emailprotected ] 99-04 uses a reluctor ring with different. To a Stop, Noises and Leakage: Cant Keep this honda FIT on the intermediate clutches, get! A nice crosshatch pattern for healthy engagement crosshatch pattern for healthy engagement helps determine line for. Number-5 needle bearing installs inside the forward clutch to give the 3-4 shift a... Way in the price of oil rose about 400 percent, fuel-efficient vehicles had become crucial and 1.55:1 1-2 to. Your line pressures are fine most important parts in an AODE/4R70W because it regu-lates the trans-missions pressure... Driveline, or wheels need a special tool to install a new every! Dont have a press, just about any machine shop has one which! Two one-way clutches, you want low line pressure holding the valve body expand uniformly! ] 99-04 uses a reluctor ring with a cover and C-clip mode, line pressure electronically mechanically modulated AOD has.
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