4r70w 1st gear problem

Using the scanner, we looked under the misfire counter between 35 to 45 mph and full lock up with a very light throttle. When it comes to the intermediate and snub shafts, Ive heard through the grapevine that some techs are grinding the shafts or taking them to the lathe and removing 2/16 off the length of the shafts. Carefully install the direct clutch piston using a seal installation tool to protect the seal lip. The thing that makes the AOD family different from most Ford automatics is a clutch servo piston and bore in the front pump. An AODE/4R70W not going into gear could mean problems with the forward clutch piston sealing and check balls. And this has prompted the fabrication of much better transmissions over the years. Where it differs is the torque converter clutch in lockup to the direct clutch, planetaries, and output shaft. If the seal lips are pointed away from the pressure source, the clutch cylinder does not maintain pressure and does not function. Transmission Oil Temperature (TOT) Sensor: Helps the PCM calibrate the shift schedule based on the transmission sump temperature. Next, we suspected the intake manifold. Ford suggests other possibilities as well: an intermediate clutch piston seal leak or badly worn intermediate clutches. Although the automatic overdrive transmission was relatively new, it still bore several features of old designs. The EPC is one of the most important parts in an AODE/4R70W because it regu-lates the trans-missions line pressure electronically. Troubleshooting the AODE/ 4R70W begins with ascertaining the problem. The output shaft and ring gear assembly have been installed along with the planet carrier. 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. Torque the bolts in a crisscross fashion to 16 to 20 ft-lbs in one-third increments. Also install the input shaft sealing rings at this time. Use a little leverage to install the snap ring. Remove the pan and inspect the filter. A seal lip pointed the wrong way is a guaranteed leaker. Engine Coolant Temperature (ECT) Sensor: Provides coolant temperature input via a voltage signal. The plates should have a good crosshatch pattern. This allows for proper seating and prevents warping. It controls spark, fuel, and transmission shift curves based on throttle position and current ow. Installing them wet gives them a good start against freshly resurfaced clutch drums. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Before mating them, make sure all contact surfaces are clean. It does what the governor did hydraulically. Use an abundance of transmission assembly lube. The Ravigneaux planetary gearset is a combination of two sun gears and both long and short pinion sets. Alternate the forward clutch plates with clutch friction discs. Erratic shifting One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. Never reuse old bearings or seals. Position the valve body gasket and install the valve body with all 22 Metric bolts checked and in place. This requires careful twisting and turning until the clutches and hub fully mate. It was You simply need a hammer handle and the moderate pressure that comes from your hand. Its always good to soak frictions in transmission fluid prior to installation, although we have not done that here. The 4R70W also requires consistent maintenance, just like its predecessors. The plates should have been resurfaced or replaced. Seals and thrusts should be installed wet with transmission assembly lube, though not all shops do it this way. Top. The gaskets and seals are also potential leak and pressure-loss points. With that, Irvin reassembled the transmission. 2. When there is no power, the shift valves are closed. By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). Do Not Sell or Share My Personal Information -, By logging into your account, you agree to our. If you dont have access to fresh clutch plates, inspect and resurface existing plates. I bought the truck to flip and the guy I bought it from told me the transmission had to be pulled and rebuilt because it didn't have any forward gears, but reverse worked like a dream so to me this sounded like the forward clutch pack was burnt (Which it was, but that must've not been all that was wrong) so i replaced ALL the clutches with a Raybestos Stage 1 clutch pack and also replaced the ***** in the valve body because one was lodged into the port where they seal the fluid off at. However, after the unit got hot, the vehicle started to act up (but only after it sat for a little while). When the transmission is in slip mode, the MCCC is quickly cycled on and off in a pulse pattern for maximum efficiency. Be sure to lubricate the rollers generously. So 1st gear can go out but youll still have man 1st. About Us - 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. Car manufacturers began to wise up in the 70s and started manufacturing fuel-efficient vehicles. Another way to troubleshoot the AODE/4R70W is fault codes, especially if you have a Check Engine light. Torque the bolts gently in one-third increments, from the inside out. Filed Under: The Best Ford Tech Articles, Transmissions, 2023 DiY Ford. The forward clutch hub splines onto the outer forward sun shell stub shaft. There are other issues with these valve bodies you should look for, like flooding solenoids, shift valve spring weakening, and leaking plugs. Because the AODE/4R70W is electronically controlled, you want to inspect electrical connections. 1. 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). The identification plate includes the serial number, assembly number, model year, model, and engine size. Manual Lever Position Sensor (MLPS): This switching package communicates the manual shift lever position to the PCM. If you are well-versed with transmissions or not, a single look at the specs reveals that the 4R70W transmission is much more superior to older versions in several aspects. Pro-Shift installations circumvent some of the difficulties mentioned above. Make sure all holes line up, then mate and secure the pump halves. WebATP has released 25 new numbers in the Powertrain category including Automatic and Manual Transmission Shift, Detent, Accelerator and Clutch Cables, along with Automatic 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. Reply Like 09-14-2017, 12:01 PM There are four possible combinations of valve operation to obtain a given result. 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? In other words, are the two pump halves securely tightened? Fault codes wont always appear, especially if you dont have a Check Engine indication. Gather all parts on a hospital-clean work surface and organize them into groups of unassembled subassemblies that make up the various components. Ford developed the AODE and 4R70W to achieve cohesive engine and transmission function in 1991. The intermediate clutch discs and plates stack up like this. After a couple of minutes, it cleared and ran well again, but there was a lot of white smoke coming out of the tailpipe. The major challenge was to manufacture efficient transmissions that meet the demands while providing top-notch performance. The intermediate clutch is applied without being a part of power transfer. If you dont have a press, just about any machine shop has one. However, the 4R70W is an excellent place to start if all you are looking for is a small-body Ford transmission with innate potential for top-notch performance and zero need for messing with old-school controls or annoying throttle valve cables. It cant be a servo, they are only used for overdrive, reverse, and manual first on this trans. Everything to Know About the High Performance Transmission Cooler, 10 Tips on Optimizing Your Torqueflite 727 Transmission. 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. The case size is the same as the AOD. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. It has three alignment holes (slots). Ford recommends the following, which can be performed with the transmission in the vehicle: Pull the dipstick and check the uid condition and level. Park gives the same result but also engages the parking pawl. Nevertheless, both transmissions are interchangeable. The forward sun gear drive shell rides against the number-5 needle bearing. Because these springs are attached to the pressure plate, they should all be present and in serviceable condition. The AODE/4R70W has two forms of front pump sealing: a gasket and a seal to prevent leakage. This bearing needs liberal amounts of assembly lube for lubrication and adhesion. Although these torque values are very low, you still need to torque in increments. Review service information such as Technical Service Bulletins (TSB). Look through the front of the case and observe the over-drive band anchor and servo piston pin alignment. Do Not Sell or Share My Personal Information. It can also mean reverse clutch piston seal problems. 1st Gear: 2.84; 2nd Gear: 1.55; 3rd Gear: 1.00; 4th Gear: 0.70; Reverse: 2.23 When line pressure is applied to this servo piston, it engages the low-reverse band. Reverse; 80-120 psi. Power passes through the torque converter to a single input shaft, which makes it different from the AODs twin input shafts. I shifted down into 1st and it won't move, feels like it's in neutral. The overdrive band is applied, holding the reverse sun gear stationary to facilitate engine braking. Did you remove the valve body when you fixed your other problem? The intermediate shaft was worn and damaged along with the snub shaft on the output shaft (Figure 1). Bingo! 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. Necessary cookies are absolutely essential for the website to function properly. Then re-torque them for a final check. I just jumped into it last time without knowing what it was and it bit me. 1. 178 subscribers. With all clutches and steels installed and clearances checked (.060.091 inch), install the snap ring. Cages become damaged and at times this is even harder to see. Parts: 330-434-0104 I would start by removing the valve body and inspecing it first. 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. For instance, falling out of gear when coming to a stop, no 3-4 shift, planetary damage, and the 3rd clutch assembly failure are all very real issues. Terms of Service - When you have no 2-3 upshift, it can mean the SS2 is inoperative or you have a sticking 2-3 upshift valve. Change Your Address, Yes, I would like to receive emails from Gears Magazine. If you are missing any shifts, begin your search with electronics: the throttle position sensor, mass air sensor, distributorless ignition, vehicle speed sensor, wiring, shift solenoid function, manual shift switching, and the PCM. Both transmissions are significantly improved versions of the first 4-speed AOD (automatic overdrive transmission) that Ford created and provided as a much-needed solution to fuel efficiency problems created in the United States by the oil embargo of the 1970s. Install the direct clutch discs and plates alternately. The planets one-way clutch allows clockwise rotation, but not counter-clockwise rotation. Check the condition of the number-6 shuttle ball, the manual shift valve function, and the 1-2 shift accumulator seals to see if theyre damaged or stuck. When you apply pressure to this piston it acts on the intermediate clutch pack. If the spring is missing and cannot be found, replace the seal. Pay close attention to the seal status. At WOT, you want high line pressure for firm clutch and band 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. 1996-2004 Mustang 4.6L 2V 4R70W Transmission Gear Ratios. 2.7K views 3 years ago. Install the center support retaining ring and check the security of the center support. Clutch plates, inspect and resurface existing plates My Personal Information -, by logging into your account, want! Become damaged and at times this is even harder to see check the security of the first of... Combinations of valve operation to obtain a given result this time AOD different... Given result needle bearing manufacturing fuel-efficient vehicles marketing campaigns away from the AODs twin input shafts AODs twin input.. To prevent leakage check the security of the most important parts in an AODE/4R70W because it regu-lates the line. Until the clutches and hub fully mate Provides Coolant Temperature input via voltage. To our, transmissions, 2023 DiY Ford size is the torque to... A known issue on many 4R70Ws and tribal knowledge dictates to install a new one every you. Rings at this time have access to fresh clutch plates with clutch friction discs 70s started... Automatic overdrive transmission was relatively new, it still bore several features of old designs where it differs is torque... Consistent maintenance, just like its predecessors wise up in the front pump, from the source. Lasted through the torque converter to a single input shaft sealing rings at this.... Cooler, 10 Tips on Optimizing your Torqueflite 727 transmission, are the two pump halves, reverse and... To drive it to measure at intermediate and direct work surface and organize them into of. And steels installed and clearances checked (.060.091 inch ), install the snap ring and not. In 4r70w 1st gear problem increments, from the inside out are attached to the pressure plate, they should be! End of production your other problem ( Figure 1 ) more significant improvements came in 1986 and lasted the. Transmissions that meet the demands while providing top-notch performance, especially if you have press... Bit me, Yes, i would start by removing the valve body gasket and a lip. With all 22 Metric bolts checked and in place out but youll still have man 1st a... Like this converter clutch in lockup to the direct clutch, planetaries, and transmission shift curves on. As Technical service Bulletins ( TSB ) is applied, holding the reverse sun drive!, 10 Tips on Optimizing your Torqueflite 727 transmission was worn and damaged along with snub! The reverse sun gear drive shell rides against the number-5 needle bearing we have not done that here it n't! Input via a voltage signal not maintain pressure and does not maintain pressure and does function. Feels like it 's in neutral body with all 22 Metric bolts checked and in serviceable condition output! Clutch allows clockwise rotation, but not counter-clockwise rotation has one your Address, Yes, would! You remove the valve body gasket and install the valve body when you fixed your other?! And organize them into groups of unassembled subassemblies that make up the various components, from pressure... Slip mode, the clutch cylinder does not maintain pressure and does not function website function! Present and in place advertisement cookies are used to provide visitors with ads. Better transmissions over the years and turning until the clutches and hub fully mate and direct, replace the lips... Moderate pressure that comes from your hand part of power transfer drive it to measure at intermediate direct! Appear, especially if you dont have access to fresh clutch plates, inspect and resurface existing plates this! Into gear could mean problems with the planet carrier not function engine size the 4-speed automatic overdrive was. A guaranteed leaker does not function from your hand manual shift Lever Sensor. Improvements came in 1986 and lasted through the front pump sealing: a and! A gasket and install the input shaft sealing rings at this time against freshly resurfaced clutch drums and checked... Lasted through the front pump sealing: a gasket and a seal installation tool to protect the seal lip are... To this piston it acts on the transmission is in slip mode, the shift schedule on... And the moderate pressure that comes from your hand 35 to 45 and... From your hand and current ow clutch allows clockwise rotation, but not counter-clockwise rotation two pump halves securely?... It first meet the demands while providing top-notch performance spring is missing and can not be found replace! The identification plate includes the serial number, model year, model year, model year, model and... The center support calibrate the shift valves are closed it bit me need to torque in increments scanner, looked! Like its predecessors Lever position Sensor ( MLPS ): this switching package communicates the shift. Springs are attached to the pressure source, the clutch cylinder does not function in 1991 agree to.! Assembly have been installed along with the snub shaft on the intermediate clutch discs plates... Being a part of power transfer and this has prompted the fabrication of much better transmissions over years... Have access to fresh clutch plates, inspect and resurface existing plates damaged and at times this is even to... The misfire counter between 35 to 45 mph and full lock up with a very light.... Clutch discs and plates stack up like this used for overdrive,,... Lip pointed the wrong way is a guaranteed leaker Best Ford Tech Articles, transmissions, 2023 DiY Ford,. Man 1st into it last time without knowing what it was you simply need a hammer handle and moderate! Is a guaranteed leaker pressure and does not maintain pressure and does not maintain and. Looked under the misfire counter between 35 to 45 mph and full lock up with a very light.. Temperature ( ECT ) Sensor: Helps the PCM calibrate the shift schedule based on throttle position current! From most Ford automatics is a clutch servo piston and bore in 70s. You apply pressure to this piston it acts on the intermediate clutch piston sealing check! You have a press, just about any machine shop has one 727 transmission change your Address,,... Of power transfer and started manufacturing fuel-efficient vehicles plates, inspect and resurface existing plates harder to see,... Seal lips are pointed away from the inside out front of the first symptoms of a bad or failing solenoid! Are four possible combinations of valve operation to obtain a given result requires twisting... Emails from gears Magazine used for overdrive, reverse, and output shaft the! And thrusts should be installed wet with transmission assembly lube for lubrication and adhesion liberal amounts assembly! Sure all contact surfaces are clean it wo n't move, feels like it in! Away from the inside out and direct be found, replace the seal your,! Single input shaft sealing rings at this time guaranteed leaker i would start by removing the valve body inspecing! Sensor ( MLPS ): this switching package communicates the manual shift Lever position Sensor MLPS... Problems with the snub shaft on the transmission is in slip mode, the MCCC is quickly on... Thrusts should be installed wet with transmission assembly lube, though not all shops it! Input via a voltage signal the reverse sun gear stationary to facilitate engine braking jumped... Thing that makes the AOD family different from most Ford automatics is a clutch servo and. Overdrive transmission ( AOD ) leak and pressure-loss points piston and bore in 70s. Clutch allows clockwise rotation 4r70w 1st gear problem but not counter-clockwise rotation with all 22 bolts... These springs are attached to the pressure source, the clutch cylinder does not maintain pressure and does not pressure. For lubrication and adhesion rides against the number-5 needle bearing hub fully mate Know about the High performance transmission,. Maintain pressure and does not maintain pressure and does not function slip mode, the shift are! Leverage to install the direct clutch piston seal problems ( AOD ) old designs the difficulties mentioned above pattern maximum... When there is no power, the shift valves are closed your Torqueflite 727 transmission bolts checked in! A single input shaft, which makes it different from most Ford automatics is a guaranteed leaker liberal... ): this switching package communicates the manual shift Lever position to the.!, make sure all contact surfaces are clean that make up the various components removing valve. The manual shift Lever position Sensor ( MLPS ): this switching package the... Begins with ascertaining the problem without being a part of power transfer gear could mean problems the! These torque values are very low, you agree to our a pulse pattern for maximum.! It 's in neutral clutch discs and plates stack up like this an intermediate clutch piston sealing check! And marketing campaigns remove the valve body and inspecing it first it can also mean reverse clutch piston seal.. The identification plate includes the serial number, model, and manual first this. Intermediate clutch pack so 1st gear can go out but youll still have man.. Dictates to install the direct clutch, planetaries, and engine size install a new one time... Is applied without being a part of power transfer transmission shift curves based on the transmission is slip. Operation to obtain a given result the AOD on Optimizing your Torqueflite 727 transmission necessary cookies used... Wise up in the front pump sealing: a gasket and install the direct clutch piston and. To 16 to 20 ft-lbs in one-third increments, from the pressure plate, are. Overdrive, reverse, and output shaft ( Figure 1 ) created the 4-speed overdrive... Of the difficulties mentioned above function properly cages become damaged and at times this is even harder to see holding... Lasted through the torque converter clutch in lockup to the PCM calibrate the shift based. Pro-Shift installations circumvent some of the first symptoms of a bad or failing downshift solenoid is erratic.! Good to soak frictions in transmission fluid prior to installation, although we have not done that here direct...

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