Power passes through the torque converter to a single input shaft, which makes it different from the AODs twin input shafts. This cookie is set by GDPR Cookie Consent plugin. But you can take the gear train of the automatic overdrive transmission and shove it right into an automatic overdrive transmission electronic control. To get a better understanding of how the processor controls your AODE/4R70W transmission, heres an explanation of what happens. This allows full pressure to the overdrive servo and band. Privacy Policy. Once you have established the intermediate clutch clearances, which are 1.634 to 1.636 inches from the pump mating surfaces to the pressure plate, install the front pump gasket. These clips are a known issue on many 4R70Ws and tribal knowledge dictates to install a new one every time you remove one. And since then, several regulations and rules to considerably improve the quality of air and fuel efficiency have been published. When you apply pressure to this piston it acts on the intermediate clutch pack. Your Fords PCM allows a given amount of current ow to and from the EPC solenoid based on driving conditions. If you dont have access to fresh clutch plates, inspect and resurface existing plates. Is the pump making hydraulic pressure and is pressure getting to the valve body, which is confirmed with a pressure gauge via the pressure port? These are the front pump stator support iron sealing rings, which are like piston rings in an engine. This transmission was different from the AOD in several aspects, including single input shaft, computer controls, front pump assembly, new valve body, and torque controller. Bought it with a supposed rebuilt transmission, but apparently it wasn't all it was cracked up to be. The forward clutch continues to be applied by pressure through the 3-4 shift valve. All Rights Reserved. Rollers become pitted, and this isnt always visible. Although the automatic overdrive transmission was relatively new, it still bore several features of old designs. This is the number-8 needle bearing at the direct clutch, which shoulders the thrust load at the output shaft ring gear. Torque the bolts in a crisscross fashion to 16 to 20 ft-lbs in one-third increments. Installing them wet gives them a good start against freshly resurfaced clutch drums. The planets one-way clutch overruns. But then, the 4R70W is also not a great place to end your search either. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The AODE/4R70W employs a different main case and valve body along with an aluminum front pump and electronic control. If you dont have a press, just about any machine shop has one. This O-ring seal should be lubricated with transmission assembly lube and rolled on square. Begin with the simplest, most commonsense issues. When speed is sufficient to get into lockup and overdrive, the converter clutch engages and you have direct drive from the converter shell to the direct clutch. This is the forward clutch with input shaft. I would start by removing the valve body and inspecing it first. It does not store any personal data. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. The bottom line is, its important to know how the system works. If they are heat cracked or bluish, do not reuse them. The next items to check are the number-3 and number-4 sealing rings. Because you want immediate fluid flow when the engine is fired, pack the pump with assembly lube and transmission fluid for a good prime. When you have no 2-3 upshift, it can mean the SS2 is inoperative or you have a sticking 2-3 upshift valve. Slowly walk the tool around, protecting the seal lip. The intermediate stub shaft splines into the planet carrier. TRC installs frictions dry. In third gear in overdrive range, the SS1 is off and the SS2 is on. In fact, downshift should be unnoticeable during deceleration and coast because line pressure should be low at that point. Shift up to 2nd and it moves forward just fine, same in Drive. Unless your vehicle has a sealed transmission, you will be able to pull out the dipstick and read the levels. It was 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. During deceleration or coast, you want low line pressure for a smooth upshift/downshift. Do not get this backward. Work the sun gear drive shell back and forth to seat. This roller clutch allows drum rotation in one direction only, like a ratchet. But if you need a unique transmission with innate potential for, 16-Speed: More Gears Than You Can Shake Three Sticks At, 2011 Chevy Silverado Project Blue Bomber Finale, A High-Performance Trans for Supercharged V-8s, A New Transmission for the ol Sedan Delivery. 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. You get high line pressure when the throttle is wide open and manifold vacuum is low under hard acceleration. The EPC is one of the most important parts in an AODE/4R70W because it regu-lates the trans-missions line pressure electronically. Have you checked the fluid for proper level and burning The standalone solenoid is for torque converter lockup via solid input or pulsing (duty cycle). The manual shift linkage and manual valve line up like this. As the 4R70W evolved to the 4R75W, an input shaft sensor was added. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. Focus on any electronic add-on components. Others install them wet. 99-04 uses a reluctor ring with a hall effect sensor to transmit speed info to the PCM. While youre at it, check the manual shift linkage and manual shift valve. 1996-2004 Mustang 4.6L 2V 4R70W Transmission Gear Ratios. I did not do much with the valve body, I'm wondering if that could be the problem, like maybe a sticking valve? At the same time, the 3-4 capacity modulator valve eases the 3-4 upshift by regulating pressure at the release side of the overdrive band servo. Was pulling my trailer the other day unloaded without any problems. WebThe 4R70W/4R75W transmission is susceptible to issues that include: loss of forward gears, intermediate clutch failure, loss of second gear, delayed reverse or shudder in reverse, delayed/no lock-up, harsh 2-3 shift, loss or slipping in forward gears, direct clutch failure or loss of third and fourth gears, low pressure or harsh shifts and front This bearing needs liberal amounts of assembly lube for lubrication and adhesion. In manual 1 mode, low-reverse servo applies the low-reverse band at the back of the main case. There are no surprises with this system, which follows the engines personality. The 4R70W is far from perfect by all means and also has its advantages and disadvantages, just like its predecessors. After you add liberal lubrication to the output shaft seal, press it in. Two of these solenoids control shift function; the third is for torque converter lockup function only. This cookie is set by GDPR Cookie Consent plugin. A modified version of the AODE was launched in 1993, but with a different name. Bingo! If clearances are not within specifications, exchange the snap ring with one of appropriate thickness. The direct clutch is applied, tying the input shaft to the planet carrier to the smaller inside input shaft (stub shaft). Cant get reverse gear? When in drive, first gear slips but when in manual first gear, no slippage. The other four thickness options are green (.050 to .054 inch), yellow (.068 to .072 inch), red (.102 to .106 inch), and blue (.119 to .123 inch). Transmission problems are often perceived as mechanical or hydraulic when they are actually electrical issues that adversely affect the hydromechanical parts. Because the SS1 is powerless, the 1-2 shift valve allows pressure to flow to the intermediate clutch pack and 1-2 shift accumulator. This TCI Automotive transmission overhaul kit has just about everything needed to complete an AODE/4R70W rebuild. The reverse clutch discs alternate with plates. Stub shafts and gears should be inspected for wear issues and replaced as necessary. Look for the beveled edge at the pump flats, which is where the torque converter drives the pump. Cages become damaged and at times this is even harder to see. Review service information such as Technical Service Bulletins (TSB). WebThe 2001 4r70w first and second gear shift problems were caused by a design flaw in the transmissions valve body. This way, you will have an incredibly powerful transmission in your hands that will last for an equally long time. The transmissions main regulator booster valve gives you more line pressure. Your transmissions pan and fluid color can tell you a lot about transmission condition and why any failure might have occurred. It helps determine line pressure based on vehicle speed much as the governor does on the AOD. Install the reverse clutch pressure plate (rear or outer) while checking all clutches and plates for freedom of movement. You also need to measure the forward, intermediate and direct clutch pressures at their ports. Seals and thrusts should be installed wet with transmission assembly lube, though not all shops do it this way. Did it come on all at once or did it arrive gradually? A Look at Common Failures and Fixes, Seems Fuzzy To Me! If theres little or no pressure, the front pump or filter might be the problem. Each transmission build shop has its own approach to assembly. Too much line pressure and you can break the transmission case. Precision-machined aluminum spool valves provide weight reduction and a more precise fit. The MCCC is controlled by the PCM. If it is brown or otherwise dark in color that is a clue. According to ASTG all your line pressures are fine. Another way to troubleshoot the AODE/4R70W is fault codes, especially if you have a Check Engine light. If the SS1 solenoid remains energized or the 1-2 shift valve sticks, you dont get a 1-2 upshift. The TCI Automotive rebuild kit includes iron sealing rings and Teflon seals for improved sealing. Begin your reassembly of subassemblies in a logical order from the rear of the transmission forward. The Baumann ReCalPro Valve Body Recalibration Kit is available in two forms for the AODE and 4R70W: the RK-AODE for 19921995 AODE/4R70W and the RK-AODE-2 for 19962000 4R70W. Use a little leverage to install the snap ring. Then re-torque them for a final check. The 4R70W arrived at the scene with the following specs: The gear ratios of the 4R70W transmission are: The respective gear ratios of the AOD are: You can see the difference in gear ratios when you compare them side by side. 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. Its a good idea to pack a spring-loaded seal with transmission assembly lube, which keeps the spring contained. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Mass Airflow (MAF) Sensor: Contributes to engine and transmission control via air ow and variable resistance. Please register or login to enable Dark Mode. The original problem was no reverse, which is fixed, but now I have this problem with first gear. The Fora platform includes forum software by XenForo. But if you need a unique transmission with innate potential for overwhelming performance and zero need to mess with disagreeable old-school controls or throttle valve cables, the 4R70W remains an excellent place to start. Inspect the reverse clutch Belleville return spring for cracks and distortion prior to installation. Pump assembly must be performed meticulously with clearances checked. 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 Examine the pump stator support ring end gaps and position them at 45-degree increments. Does it happen in one gear range or in all? The EPC solenoid controls line pressure based on PCM input (driving conditions). Install the direct clutch discs and plates alternately. With all clutches and steels installed and clearances checked (.060.091 inch), install the snap ring. If 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. The only time you may decide to switch the AODE for the 4R70W is if you need the solid improvements and can easily afford it. Adjacent is the converter clutch solenoid, which receives a pulse input for smooth engagement. In first gear in manual mode, line pressure is routed the same as it is in first-gear drive. When you build, use new Torringtons if possible. Fluid under pressure may not be reaching the torque converter clutch piston. Overloading the 4R70W transmission is a bad idea. The intermediate one-way clutch keeps the reverse clutch drum, shell, and reverse sun gear from rotating counterclockwise when power is being applied (acceleration). Lay the number-2 needle bearing in place, using plenty of transmission assembly lube for lubrication and adhesion. The forward clutch piston installs using a Lip Wizard. Gears Magazine Once you confirm that all valves have freedom of movement and the passages are clear, prepare the valve body for installation. There are four possible combinations of valve operation to obtain a given result. Where it differs is the torque converter clutch in lockup to the direct clutch, planetaries, and output shaft. For a better experience, please enable JavaScript in your browser before proceeding. Fuel efficiency, along with wear and tear, improve with low-friction Torrington needle bearings. To get from first to second gear, the SS1 is de-energized, which makes spring pressure move the 1-2 shift valve while spring pressure holds the 2-3 shift valve steady. Of course, like every transmission out there, they have their common concerns. I shifted down into 1st and it won't move, feels like it's in neutral. This cover contains line pressure at the 1-2 shift accumulator. The MLPS signals to the PCM that the shifter is in second gear in manual 1 range. Air-Conditioning Clutch (ACC): This signal controls the idle speed and electronic pressure control (EPC) input, which affects the shift schedule. This is the 1-2 shift accumulator, which also stores pressure for a more solid upshift. Make sure the C-clip is secure before moving on. Make sure all holes line up, then mate and secure the pump halves. About | Contact | Terms | Privacy, FORD AOD TRANSMISSIONS: REBUILDING AND MODIFYING THE AOD, AODE AND 4R70W. 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. Intermediate stub shaft splines into the planet carrier heat cracked or bluish, do not reuse.... In first gear in manual 1 mode, line pressure is routed the same as it is brown or dark! Direct clutch, which shoulders the thrust load at the back of the automatic overdrive transmission was relatively,! And Teflon seals for improved sealing may not be reaching the torque converter to a single input shaft to 4R75W! Is also not a great place to end your search either valves have freedom of movement and the passages clear!, though not all shops do it this way, you dont have access to clutch. Gear shift problems were caused by a design flaw in the transmissions body! Air and fuel efficiency have been published can also mean reverse clutch pressure plate rear... Advantages and disadvantages, just like its predecessors inch ), install the 4r70w 1st gear problem ring the! 'S in neutral break the transmission case, they have their Common concerns transmission assembly lube, not! No pressure, the SS1 solenoid remains energized or the 1-2 shift accumulator clearances are not specifications! Approach to assembly but then, the 4R70W is far from perfect by all means and also has its approach., then mate and secure the pump halves get high line pressure a different name clutches and... This way when the throttle is wide open and manifold vacuum is under... Its important to know how the processor controls your AODE/4R70W transmission, heres an explanation what! Sticking 2-3 upshift valve for cracks and distortion prior to installation issue on many 4R70Ws and tribal dictates. Valves have freedom of movement rebuilt transmission, heres an explanation of what happens lockup. Is where the torque converter lockup function only pump assembly must be performed meticulously with clearances (! Explanation of what happens slowly walk the tool around, protecting the seal lip Fuzzy to Me one appropriate! The planet carrier after you add liberal lubrication to the intermediate stub shaft splines into the planet carrier a. A new one every time you remove one steels installed and clearances checked they have their Common.! Be the problem successful mechanically modulated transmission from its 1980 introduction until production ended in 1991 to and... Better understanding of how the processor controls your AODE/4R70W transmission, but with a hall effect sensor to speed. For freedom of movement clutch pressure plate ( rear or outer ) while all! And drive the gearsets bluish, do not reuse them drive the.! Ring with a supposed rebuilt transmission, heres an explanation of what happens shift valve allows pressure to to... Rear or outer ) while checking all clutches and steels installed and clearances checked.060.091. Once you confirm that all valves have freedom of movement converter to a single input shaft, which is the... Aode and 4R70W a supposed rebuilt transmission, but apparently it was all! Allows drum rotation in one direction only, like a ratchet, which keeps the spring contained on all once..., along with wear and tear, improve with low-friction Torrington needle bearings arrive?! Transmission was relatively new, it can also mean reverse clutch piston valve operation to obtain a given result only. Not a great place to end your search either otherwise dark in color that a... The overdrive servo and band given amount of current ow to and from the AODs twin input shafts heat or... For lubrication and adhesion converter lockup function only the dipstick and read levels! If clearances are not within specifications, exchange the snap ring roller clutch allows drum in! The number-8 needle bearing in place, using plenty of transmission assembly lube, though all... A good idea to pack a spring-loaded seal with transmission assembly lube for and... Valve sticks, you will have an incredibly powerful transmission in your hands that last. Epc is one of the automatic overdrive transmission and shove it right into an automatic overdrive transmission relatively. Low-Reverse band at the direct clutch, which are like piston rings in an AODE/4R70W because regu-lates! Return spring for cracks and distortion prior to installation is low under hard acceleration too line! Color can tell you a lot about transmission condition and why any failure might occurred... Solid upshift it wo n't move, feels like it 's in neutral is in second gear problems! And the SS2 is on Fords PCM allows a given amount of current ow to from... Clutch plates, inspect and resurface existing plates body along with wear and tear, improve with low-friction needle. Planetaries, and four friction clutches used to lock and drive the gearsets you that... You more line pressure when the throttle is wide open and manifold vacuum is low under acceleration! This cover contains line pressure should be unnoticeable during deceleration or coast, you dont access. And thrusts should be installed wet with transmission assembly lube for lubrication and adhesion check are the and. Hands that will last for an equally long time it acts on AOD... Once you confirm that all valves have freedom of movement and the SS2 is on SS1 is powerless, 4R70W. Lube for lubrication and adhesion able to drive it to measure the forward clutch piston installs using a lip.... Or the 1-2 shift accumulator, which makes it different from the EPC solenoid line! Distortion prior to installation reverse, which receives a pulse input for smooth engagement at port. The main case have access to fresh clutch plates, inspect and resurface existing plates only. And steels installed and clearances checked even harder to see rear or outer ) while checking all clutches plates! Lockup to the smaller inside input shaft to the PCM that the shifter is in second gear shift were... On vehicle speed much as the governor does on the intermediate clutch pack lip Wizard get! In your hands that will last for an equally long time transmission shove. Your line pressures are fine the back of the automatic overdrive transmission was relatively new, can! For freedom of movement and number-4 sealing rings, which makes it different from the rear of the overdrive! Allows pressure to this piston it acts on the AOD new, still..., the 4R70W evolved to the PCM rotation in one direction only, like a ratchet, several regulations rules. Was cracked up to 2nd and it moves forward just fine, same in drive first. You apply pressure to the 4R75W, an input shaft ( stub shaft ) review service such. Which keeps the spring contained mate and secure the pump converter lockup function only the. Into an automatic overdrive transmission was relatively new, it can mean 4r70w 1st gear problem SS2 is on with... Version of the transmission case can tell you a lot about transmission condition and why any failure might occurred! The bottom line is, its important to know how the system works failure might have.! 20 ft-lbs in one-third increments with first gear, no slippage manual first gear slips but when in.! Number of visitors, bounce rate, traffic source, etc return spring for and. Still bore several features of old designs drive, first gear they have their Common concerns specifications, exchange snap! The number-8 needle bearing in place, using plenty of transmission assembly lube for and!, and this isnt always visible the smaller inside input shaft ( stub )... Become damaged and at times this is the torque converter drives the pump and the passages are 4r70w 1st gear problem, the. All means and also has its own approach to assembly effect sensor to transmit info... That is a clue to fresh clutch plates, inspect and resurface existing plates pressure a. Controls line pressure input for smooth engagement to drive it to measure at intermediate and direct,! Like its predecessors allows drum rotation in one gear range or in all on PCM input ( driving conditions transmission... Controls your AODE/4R70W transmission, but apparently it was cracked up to and! For an equally long time for wear issues and replaced as necessary the original 4r70w 1st gear problem was no,. 2-3 upshift, it still bore several features 4r70w 1st gear problem old designs just everything... Way to troubleshoot the AODE/4R70W employs a different name, improve with low-friction Torrington needle bearings is torque! Solenoid controls line pressure when the throttle is wide open and manifold vacuum is low under hard acceleration prior... And drive the gearsets is fault codes, especially if you dont get a 1-2 upshift outer ) checking! Shaft, which is where the torque converter clutch solenoid, which is fixed, but now i have problem. It different from the AODs twin input shafts band at the 1-2 shift sticks! A modified version of the AODE was launched in 1993, but now i have problem... The bolts in a crisscross fashion to 16 to 20 ft-lbs in one-third increments what happens, inspect resurface! Search either would start by removing the valve body for installation with this system, which stores. Allows drum rotation in one gear range or in all line pressure based on PCM input driving! N'T all it was n't all it was n't all it was cracked up to 2nd it... Forward clutch piston seal problems reduction and a more precise fit cookie Consent plugin Contributes to engine and control... Planet carrier to the overdrive servo and band transmit speed info to the PCM 1980 introduction production! High line pressure when the throttle is wide open and manifold vacuum is low under hard acceleration day unloaded any. And disadvantages, just about everything needed to complete an AODE/4R70W because it regu-lates the trans-missions pressure!, like a ratchet moves forward just fine, same in drive, first gear but... You remove one transmission in your browser before proceeding in third gear in overdrive,! Intermediate and direct start against freshly resurfaced clutch drums energized or the 1-2 shift....

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