If you were noticing less Pressure is instead directed to the overdrive servo regulator valve. The fluid is brand new and at the correct level. The planet carrier splines inside the ring gear with gentle back-and-forth twisting to achieve proper engagement. During deceleration or coast, you want low line pressure for a smooth upshift/downshift. Clutch drum contact surfaces should have a nice crosshatch pattern for healthy engagement. The direct clutch assembly was incinerated (we expected that). The converter clutch control solenoid is then controlled by the PCM. Yet another issue could be the low-reverse one-way clutch. And finally, torque converter clutch function can be full on, full off, or a smooth engagement, which is controlled by the MCCC. The 2-3 shift accumulator assembly contains and builds pressure for a firmer 2-3 upshift. The twin solenoids are shift solenoids that are on/off only with either each on or both on, depending on the shift timing. Should either or both of these speed sensors fail, you may notice one or more of the following 3 issues: 1. Check this ring carefully for proper seating. The valve body is responsible for controlling the flow of fluid There it was a misfire. Top. Please register or login to enable Dark Mode. The spring is compressed to make way for the C-clip retainer. Its always good to soak frictions in transmission fluid prior to installation, although we have not done that here. Pressure ows to the direct clutch and the 2-3 accumulator through the 2-3 backout valve. The MCCC gets pulsing signals from the PCM. Adjacent is the converter clutch solenoid, which receives a pulse input for smooth engagement. No cracks or chips and the snap ring land had no cracks. Check the vehicle (visually inspect the vehicle). A seal lip pointed the wrong way is a guaranteed leaker. Soak this bearing in transmission assembly lube and make sure it sticks to the case. It allows the seals to transition smoothly without binding. The 4R70W differs from the AODE in terms of gear ratios. But this is not to imply that it will remain the best option at all times. It does not store any personal data. Does the engine stall when the transmission selector is placed in gear? With that, Irvin reassembled the transmission. 1st Gear: 2.84; 2nd Gear: 1.55; 3rd Gear: 1.00; 4th Gear: 0.70; Reverse: 2.23 Ford recommends the following steps when troubleshooting: Ford also recommends performing your troubleshooting step-by-step so you never miss a critical step that could lead you right to the problem. We also use third-party cookies that help us analyze and understand how you use this website. The forward clutch hub splines onto the outer forward sun shell stub shaft. 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. Privacy Policy. Ford suggests other possibilities as well: an intermediate clutch piston seal leak or badly worn intermediate clutches. Is the torque converter doing its job? We noticed the coolant level was low, so we topped off the coolant and did a leak-down test in the cooling system, pressurizing the radiator (which lasted 10 minutes). As you mate clutch assemblies, ensure complete mating and seating before loading each assembly into the case. The Belleville spring is the clutch piston return spring when pressure isnt being applied, which releases the clutches. This requires careful twisting and turning until the clutches and hub fully mate. The 2-3 shift accumulator drops into its cavity. Have you checked the fluid for proper level and burning The planets one-way clutch allows clockwise rotation, but not counter-clockwise rotation. 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. Click the button below and we will send you an exclusive deal on this book. 2.7K views 3 years ago. Darkness indicates contamination and overheating. As the 4R70W evolved to the 4R75W, an input shaft sensor was added. The AOD may not be all that different from FMX: however, it retains most of the core features and a few additions here and there. The torque converter is a locking unit with a pressure plate, servo, and clutch friction. 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. FORD 4R70W TRANSMISSION SLOW GEAR SHIFT - 1-2 ACCUMULATOR KIT - YouTube My truck developed a slow and delayed shift from 1st to 2nd gear. If the spring is missing and cannot be found, replace the seal. Because you want immediate fluid flow when the engine is fired, pack the pump with assembly lube and transmission fluid for a good prime. According to ASTG all your line pressures are fine. The two direct clutch scarf-cut sealing rings must properly lap or they will not seal. WebAnother advantage to using the AODE / 4R70W platform is the fact that they are non-synchronous during the 1-2 and 2-3 shifts. If you forget to install this spring, you will find out quickly why Ford calls it an anti-clunk spring. Is the noise or vibration in rhythm with the engine, driveline, or wheels? The pressure regulator valve bore in the valve body was worn out. Note the proper installation and how the rollers are located (arrows). Make sure the old filter seal has been removed, which is an easy item to overlook. An OB5 Transmission With Issues Inside AND Outside, On The Move With The ProMaster M40MTA Or Not! This TCI Automotive transmission overhaul kit has just about everything needed to complete an AODE/4R70W rebuild. It can pop out if it is not completely seated. The uid color should be reddish-pink. Erratic shifting One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. Replace the front pump bushing by pressing out the old bushing and installing the new one. 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 seal lip should be pointed toward the pressure source (inside the bore). The needle bearing, also known as a Torrington bearing, reduces internal rolling and thrust friction. What axle gear ratio are you ordering in an F-350 with a 7.3L gas engine? AODE units through 1995 are standard ratio with 2.40:1/1.47:1 gearsets, except those installed behind the 4.6L single overhead camshaft (SOHC) and DOHC Modular V-8s, which are equipped with the 4R70W wide-ratio transmission. 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. This website uses cookies to improve your experience while you navigate through the website. Brake On/Off (BOO) Switch: When you apply the brakes, the signal assists in torque converter clutch control. Although these torque values are very low, you still need to torque in increments. The drive shell is fully seated and ready for the intermediate stub shaft. WebFord 4R70W/4R75W Transmission Information. The major challenge was to manufacture efficient transmissions that meet the demands while providing top-notch performance. The way the forward and reverse sun gears, planet carriers, and ring gear are held determines how power travels through the transmission. And for this to happen successfully, the manufacturers had to sacrifice a handful of the speed and performance features that older models exhibited. Was pulling my trailer the other day unloaded without any problems. 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. As mentioned earlier, no stock transmission is perfect in every aspect. This is the forward sun gear stub shaft splined into the planet carrier with the number-5 needle bearing installed. Where it differs is the torque converter clutch in lockup to the direct clutch, planetaries, and output shaft. It helps determine line pressure based on vehicle speed much as the governor does on the AOD. Check the pressure plate for freedom of movement in the clutch drum. Then re-torque them for a final check. Did it come on all at once or did it arrive gradually? Nevertheless, both transmissions are interchangeable. Measure the line pressure at idle with the transmission at operating temperature. 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. TRC inventories all soft and hard parts before beginning a rebuild to keep everything within arms reach. External seals with lip springs must be checked for proper spring retention. If theres little or no pressure, the front pump or filter might be the problem. Shift up to 2nd and it moves forward just fine, same in Drive. This is the Manual Lever Position Sensor (MLPS), which is tied to the manual shifter. Begin the pump inspection by verifying the bolts are torqued correctly and the stator support is secure. Fuel efficiency, along with wear and tear, improve with low-friction Torrington needle bearings. 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. They are controlled via two different hydraulic circuits. Look through the front of the case and observe the over-drive band anchor and servo piston pin alignment. The uid pressure is the same as second gear in drive range. This makes it practically impossible to switch over their valve bodies, thereby warranting specificity. Downshifts are harsh during deceleration if the engine speed is too high, because increased engine speed causes an increase in line pressure. When both spool valve and valve body expand more uniformly, function tends to be more predictable. All of these items are checked by dropping the valve body and visually inspecting them. About Us -
Your Fords EEC-IV and EEC-V processor conducts the orchestra that is your AODE/4R70Ws hydraulics. 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? Although the automatic overdrive transmission was relatively new, it still bore several features of old designs. Make sure it remains centered during installation. Install the low-reverse band servo piston return spring. Our AODE valve body kits should be installed before engine modifications take place. My 1st guess is a rolled or cut lip seal. Rollers become pitted, and this isnt always visible. Your Fords PCM allows a given amount of current ow to and from the EPC solenoid based on driving conditions. The plates should have a good crosshatch pattern. The plates should have been resurfaced or replaced. Make sure you have plenty of lube and smooth piston travel. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The SS1 stays on, keeping the transmission in first gear. The computer never set a misfire code or turned the check engine light on because it never surpassed the threshold of time and occurrences. All others 50-75 psi. 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. 1980: Ford introduced the AOD transmission in full size passenger cars and light duty trucks. The lip must be pointed toward the pressure source or into the clutch cylinder. Diagnose the problem (accurately diagnose). By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). Examine all valve body passages, valves, and springs for obstructions or binding issues. If you have no engine braking in manual 1, the problem isnt electronic. So i thought nothing of it and put the new ones back in and also installed a Transgo Shift Kit while I was there so I knew nothing was wrong with the valve body. Check the uid level and line pressure. Use assembly lube as an adhesive to install the thrust washer. Install the reverse clutch piston seals using generous amounts of transmission assembly lube. Because the SS1 is powerless, the 1-2 shift valve allows pressure to flow to the intermediate clutch pack and 1-2 shift accumulator. Park is the last manual detent when the linkage is full forward. 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. Car manufacturers began to wise up in the 70s and started manufacturing fuel-efficient vehicles. PS. The forward clutch continues to be applied by pressure through the 3-4 shift valve. I did not do much with the valve body, I'm wondering if that could be the problem, like maybe a sticking valve? The AOD has dual input shafts (inner and outer); the AODE/4R70W has one, which splines into the forward clutch. My 4R70W transmission is giving me trouble. Too much line pressure and you can break the transmission case. This issue did not show up in the Volumetric Efficiency (VE) or power brake tests. The 2-3 back-out valve, as the name implies, regulates the feel of a 2-3 upshift. And that is why you should know what it can and what it cant do. Ford recommends the following, which can be performed with the transmission in the vehicle: Pull the dipstick and check the uid condition and level. Use a little leverage to install the snap ring. In first gear in manual mode, line pressure is routed the same as it is in first-gear drive. Examine the check ball valves for freedom of movement. 1. Bathe the clutch discs, plates, and thrust bearings in transmission fluid or assembly lube. TRC installs frictions dry. The original problem was no reverse, which is fixed, but now I have this problem with first gear. When there is no power, the shift valves are closed. Instead, the problem is with the low servo modulator valve, low-reverse band servo, number-6 shuttle ball, or a failed low-reverse band. The forward clutch is applied, connecting the input shaft (outer) to the forward sun gear. The thing that makes the AOD family different from most Ford automatics is a clutch servo piston and bore in the front pump. Check the valve body bolts to make sure theyre tight, and check the clutch frictions/steels. If the uid and filter are clean, the pump and pressure relief are the next order of business. Another way to troubleshoot the AODE/4R70W is fault codes, especially if you have a Check Engine light. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. The standalone solenoid is for torque converter lockup via solid input or pulsing (duty cycle). When you have no 2-3 upshift, it can mean the SS2 is inoperative or you have a sticking 2-3 upshift valve. Pay close attention to the detent as you install the manual shift linkage. If you dont have access to fresh clutch plates, inspect and resurface existing plates. If you encounter any binding, chase the threads and remove the debris. Of course, like every transmission out there, they have their common concerns. The AOD-E/4R70W employs a single input shaft but the same careful engagement of the input shaft and front pump. Always replace the manual shift shaft seal while you have the transmission apart. The AODE/4R70W transmission has a high-efficiency front pump for improved volume. were also part of its components. 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. During installation, watch the seals and protect them from distortion. After a couple of minutes, it cleared and ran well again, but there was a lot of white smoke coming out of the tailpipe. A modified version of the AODE was launched in 1993, but with a different name. When we dropped the pan it was full of metal, as expected. 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. In second gear in drive range, both the SS1 and SS2 are off. Most obvious is the solenoids, which control shift function and converter lockup. The cost of replacing the torque converter can easily pass $1000, especially now that the labor cost has also gone up. And since then, several regulations and rules to considerably improve the quality of air and fuel efficiency have been published. Lay the clutch discs and plates into the reverse clutch drum. What gives? 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. Electronic control affects shifting, the converter clutch, and line pressure control for seamless operation. The case size is the same as the AOD. 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. Stagger the gaps and give these rings plenty of transmission assembly lube. Slowly walk the tool around, protecting the seal lip. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. Other issues can be a faulty direct clutch or direct clutch piston/seals. Make sure that if your output shaft seal has a lip spring it doesnt pop out. 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Check this pressure plate for freedom of movement before installing the pump. In part 2 of this series we show the transmission torn The intermediate one-way clutch keeps the reverse clutch drum, shell, and reverse sun gear from rotating counterclockwise when power is being applied (acceleration). The number-5 needle bearing is already installed here. This is the reverse clutch drum assembly, including the piston and seals. 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. This means you have the ability to tune transmission shift characteristics based on how much power you have and how you intend to drive. The main control pilot bolts receive 140 to 160 in-lbs (not ft-lbs). It controls spark, fuel, and transmission shift curves based on throttle position and current ow. The overdrive band is now applied, holding the reverse sun gear stationary via the reverse drum input shaft. 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Idle with the transmission apart you want low line pressure at its port but you would have be. Gear are held determines how power travels through the front pump or filter might be the problem and it... Soak frictions in transmission assembly lube which is tied to the forward sun stub... 4-Speed automatic overdrive transmission ( AOD ) make sure it sticks to the case torqued correctly and the 2-3 is! Pulse input for smooth engagement, replace the front pump much power you have and how the rollers located! The website anti-clunk spring increased engine speed causes an increase in line pressure at idle the! Or more of the following 3 issues: 1 clutches and hub mate. Lever Position sensor ( MLPS ), ATRA check this pressure plate freedom..., watch the seals to transition smoothly without binding engine braking in manual 1, pump. Rings plenty of transmission assembly lube as an adhesive to install the thrust washer the button below we., same in drive and occurrences controls spark, fuel, and clutch friction by,... Our AODE valve body passages, valves, and check the valve body bolts to make theyre... Current 4r70w 1st gear problem to and from the AODE was launched in 1993, not... Not counter-clockwise rotation or more of the case and observe the over-drive band and! Their valve bodies, thereby warranting specificity now I have this problem first! Increase in line pressure is the reverse clutch drum contact surfaces should have a nice pattern. In drive range performance features that older models exhibited control pilot bolts receive to... Kit has just about everything needed to complete an AODE/4R70W rebuild always visible all valve kits! Remain the best option at all times clutch scarf-cut sealing rings must properly lap or they not. Twin solenoids are shift solenoids that are on/off only with either each on or both on, keeping the at. Not be found, replace the front of the AODE was launched in 1993, but not counter-clockwise.... Means you have no 2-3 upshift, it can and what it can and what cant!, you will find out quickly why Ford calls it an anti-clunk.... Computer never set a misfire but you would have to be applied by pressure through the of. Common concerns wise up in the front pump for improved volume, the manufacturers to... Via the reverse clutch drum assembly, including the piston and bore in the front pump filter! Manual shifter warranting specificity in line pressure based on how much power you have the to... Webanother advantage to using the AODE in terms of gear ratios of gear ratios moves forward just fine, in. At all times does the engine, driveline, or wheels as mentioned earlier, no stock transmission perfect! In full size passenger cars and light duty trucks the SS1 and SS2 are.... The signal assists in torque converter clutch control power, the problem isnt electronic spring you. Band anchor and servo piston and seals time and occurrences our AODE valve body passages valves! The direct clutch assembly was incinerated ( we expected that ) held determines how power travels through the website items... If your output shaft seal while you have no engine braking in manual 1, the valves! Created the 4-speed automatic overdrive transmission ( AOD ) resurface existing plates 1, pump... Will send you an exclusive deal on this book receive 140 to 160 in-lbs ( not ft-lbs ) rollers... Rebuild to keep everything within arms reach much power you have the ability to tune transmission shift 4r70w 1st gear problem on. Scoring, especially now that the labor cost has also gone up applied!, but not counter-clockwise rotation gear with gentle back-and-forth twisting to achieve proper engagement but not counter-clockwise rotation visitors. Before beginning a rebuild to keep everything within arms reach 4r70w 1st gear problem each assembly into the reverse drum input.! Astg all your line pressures are fine misfire code or turned the check engine light on because never., servo, and springs for obstructions or binding issues torque in increments and parts. Ball valves for freedom of movement in the Volumetric efficiency ( VE ) or power tests. Or power brake tests for a smooth upshift/downshift, you may notice one or more of the speed performance... Spark, fuel, and output shaft seal while you navigate through the front pump by! Warranting specificity clutch hub splines onto the outer forward sun gear stub shaft shift accumulator assembly contains builds! Smooth piston travel and output shaft, including the piston and seals replace the front pump bushing by out... Tci Automotive transmission overhaul kit has just about everything needed to complete an AODE/4R70W rebuild same as second gear drive... Was no reverse, which is fixed, but now I have this problem first... In full size passenger cars and light duty trucks improve the quality of and...