The pressure regulator valve bore in the valve body was worn out. The standalone solenoid is for torque converter lockup via solid input or pulsing (duty cycle). My 1st guess is a rolled or cut lip seal. There is a pronounced limit to its power and torque, and overloading it could mess things up. The MCCC engages and disengages the torque converter clutch. Check the vehicle (visually inspect the vehicle). The inner and outer forward clutch piston seals must be heavily lubricated to prevent damage during installation and to enhance sealing. About Us - Do not take shortcuts. 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 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. Look for the beveled edge at the pump flats, which is where the torque converter drives the pump. When you check the transmission uid , it should be checked with the engine running at operating temperature (150 to 170 degrees F). Another possibility is a leaking 1-2 accumulator cover or piston seal. The manual shift linkage and manual valve line up like this. If theres no power, the transmission goes into second gear instead of first. In manual 1 mode, low-reverse servo applies the low-reverse band at the back of the main case. Fault codes wont always appear, especially if you dont have a Check Engine indication. Parts: 330-434-0104 Account. Did the problem arise after transmission service or part replacement? As power begins to reach the EPC, theres less line pressure and the sliding valve is moved by spring pressure. 132 N. Howard St, Akron, OH 44308 If you were noticing less In fact, downshift should be unnoticeable during deceleration and coast because line pressure should be low at that point. Intermittent Fail Safe, Codes, Related Concerns and Solutions, The ZF 8-Speed Transmission Fluid and Filter Change, Tackling Clutch Failure in the GM 6L80/90, An Audi Opportunity! 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. The forward clutch continues to be applied by pressure through the 3-4 shift valve. The AODs more significant improvements came in 1986 and lasted through the end of production. WebFord 4R70W/4R75W Transmission Information. WebWe offer a complete suite of transmission repair, maintenance, and part replacement services, flexible payment plans, and one of Canadas best warranties. So it sounds like it could be within the valve body or maybe an o-ring is leaking? The greatest improvement was the elimination of the AOD split-torque function in third and fourth gears, which improves the driving experience. GearStar Performance Transmission WebC: Gear ratio determined as gear position which TCM supposes If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. 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. The next items to check are the number-3 and number-4 sealing rings. WebATP has released 25 new numbers in the Powertrain category including Automatic and Manual Transmission Shift, Detent, Accelerator and Clutch Cables, along with Automatic Did you install the lip seals the correct way? The AOD efficiently replaced several older transmissions that Ford put out, including the C4, C5, and FMX. It can leak on top of the boot for the number four cylinder and cause a spark to arc to the cylinder head, causing a similar effect. With light throttle pressure, the 2-3 back-out valve applies uid under pressure via an orifice. The torque converter shell, which is connected to the engines crankshaft via a explate, drives the transmissions front pump to provide hydraulic pressure and lubrication. The MCCC again gets pulses from the PCM tied to driving conditions. I would start by removing the valve body and inspecing it first. As you install the new intermediate clutch piston seals, keep in mind the seal lips must point toward the pressure source or inside the pump housing bore. Inspect the intermediate clutch pressure plate for spring integrity and inventory. Give these rings and grooves abundant lubrication. While youre at it, check the manual shift linkage and manual shift valve. 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. If you encounter any binding, chase the threads and remove the debris. If the transmission has never been apart, this information should be accurate in every detail. Next, we suspected the intake manifold. The MCCC is off (on the torque converter, no lockup). To get a free quote on transmission system services from a Mister Transmission near you, you can: Phone (800)-373-8432. Transmission Oil Temperature (TOT) Sensor: Helps the PCM calibrate the shift schedule based on the transmission sump temperature. Cant get reverse gear? Cart Shift up to 2nd and it moves forward just fine, same in Drive. Honda Accord Neutrals When It Comes To A Stop, Noises and Leakage: Cant Keep This Honda FIT On The Road. Examine the check ball valves for freedom of movement. Did you replace the scarf cut seals on the drum and made sure the cut ends were properly aligned? Torque the bolts in a strict pattern to prevent warping. It transfers power through the system, and its failure will cause a number of symptoms: loss of acceleration, shifting issues, stuck gears, slipping between gears, and overheating. Pressure all by itself doesnt move the 3-4 upshift valve. Powertrain Expo Or it could be a number of sensors both internal and external. The drive shell is fully seated and ready for the intermediate stub shaft. My 4R70W transmission is giving me trouble. Torque the bolts in a crisscross fashion to 16 to 20 ft-lbs in one-third increments. This cookie is set by GDPR Cookie Consent plugin. They are bad for breaking at the snap ring land. If the SS2 isnt energized, there is a 1-2 upshift, but the transmission never gets out of second gear. Is the torque converter doing its job? To accomplish a successful build, you should understand how the AODE and 4R70W function. The lip needs to face the fluid. The MLPS signals to the PCM that the shifter is in second gear in manual 1 range. Before getting into the workings of the AODE and 4R70W, it is important to understand their structure. The reverse clutch discs alternate with plates. Your Fords PCM allows a given amount of current ow to and from the EPC solenoid based on driving conditions. 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). These cookies ensure basic functionalities and security features of the website, anonymously. Because the SS1 is powerless, the 1-2 shift valve allows pressure to flow to the intermediate clutch pack and 1-2 shift accumulator. You want clean contact surfaces and uniform torque crisscross for optimum performance. These cookies track visitors across websites and collect information to provide customized ads. If it is brown or otherwise dark in color that is a clue. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. The AODE/4R70W is clearly a different AOD than the mechanically modulated AOD. Use plenty of lubrication as a pre-lube and for adhesion. The MLPS is a multi-position switch that signals to the PCM what gear range the transmission selector is in. If this cannot be achieved, go with the appropriate retaining ring: .060 to .064, .074 to .078, .088 to .092, or .102 to .106 inch. This allows for a pressure path to the direct clutch (engaged). I just jumped into it last time without knowing what it was and it bit me. The harness protects the wiring. The cost of replacing the torque converter can easily pass $1000, especially now that the labor cost has also gone up. When we dropped the pan it was full of metal, as expected. First gear isnt usually the first to go (no pun intended) on the 4r70w. 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. If you install the rotor backward with the beveled edge toward the intermediate clutches, the torque converter does not engage the pump. You can use C-clamps or a spring compressor to compress the springs and install a C-clip. 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. By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). 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. Begin the pump inspection by verifying the bolts are torqued correctly and the stator support is secure. The low-reverse band is applied, which holds the planet carrier during deceleration and coast for engine braking. 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. Lay the number-2 needle bearing in place, using plenty of transmission assembly lube for lubrication and adhesion. When the transmission is in slip mode, the MCCC is quickly cycled on and off in a pulse pattern for maximum efficiency. The direct clutch should be fitted with new steels and frictions. SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. When vehicle speed falls below 20 mph, the PCM energizes the SS1 for a downshift into first gear and engagement of the low-reverse servo. Torque the gasket bolts to 107 to 132 in-lbs, not ft-lbs. The twin solenoids are shift solenoids that are on/off only with either each on or both on, depending on the shift timing. Renew Subscription Sometimes the MAF sensor causes transmission problems. Most factory AOD Mustangs shift into second gear at a full-throttle RPM of 4,900 (+/- 200 rpm) and roughly 4,500 rpm from second to third. 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 following errors occurred with your submission, 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage, Clutch, Transmission, Differential, Axle & Transfer Case, Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. The EPC is one of the most important parts in an AODE/4R70W because it regu-lates the trans-missions line pressure electronically. With this sequence of events, pressure goes to the forward clutch pack through the orifice control valve and the 2-3 backout valve. No 1st Gear Been having issues with the truck accelerating slowly. Seals and thrusts should be installed wet with transmission assembly lube, though not all shops do it this way. During this time, the coolant pressure went from 17 psi to 0. Always make sure the seal lips are pointed in the right direction, toward the pressure source (the bore), and that theyre not distorted. It could be EPC or MAF sensor failure to a leak to the 3rd clutch. Fluid under pressure may not be reaching the torque converter clutch piston. Power passes through the torque converter to a single input shaft, which makes it different from the AODs twin input shafts. Another notable benefit this transmission showcases is its compatibility with several Ford vehicles with negligible modification or work. (You can unsubscribe anytime), ATRA The EPC is controlled by electrical impulses, internal pressure, and spring pressure. This is the direct clutch, steels, and thrust/needle bearings. All seals must be generously lubricated and installed properly for effective sealing. 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. Gather all parts on a hospital-clean work surface and organize them into groups of unassembled subassemblies that make up the various components. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Air pressure should be applied to serve as a valve function check. Our AODE valve body kits should be installed before engine modifications take place. The direct clutch is now applied, which connects the input shaft to the planet carrier. When they are lined up, torque bolts to 62 to 88 in/lbs (not ft-lbs). There should be nine springs in serviceable condition free of distortion. Begin with a plate and alternately stack clutch discs and plates. All Rights Reserved. You can copy and paste this link to share: https://www.diyford.com/ford-aode4r70w-guide-calibration-building-troubleshooting/. Fit the front pump, then slowly run the bolts down and pull the pump tight. 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. As a result, Ford engineers added a spring to give the 3-4 shift valve a helping hand. Fax: 330-434-3634, 2023 Gearstar Performance Transmissions. So 1st gear can go out but youll still have man 1st. Your transmissions pan and fluid color can tell you a lot about transmission condition and why any failure might have occurred. Did it come on all at once or did it arrive gradually? An EPC solenoid has also been added to the AODE/4R70W case for more predict-able operation. 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. WebAnother advantage to using the AODE / 4R70W platform is the fact that they are non-synchronous during the 1-2 and 2-3 shifts. The AOD-E/4R70W employs a single input shaft but the same careful engagement of the input shaft and front pump. Does the engine stall when the transmission selector is placed in gear? Most automatic transmission shops have the equipment to check torque converter function. Stub shafts and gears should be inspected for wear issues and replaced as necessary. The AODE/4R70W has two forms of front pump sealing: a gasket and a seal to prevent leakage. An early AODE / 4R70W can typically handle 25-50 HP above stock power levels. Most obvious is the solenoids, which control shift function and converter lockup. When line pressure is terminated, this spring returns the servo piston to rest. The two direct clutch scarf-cut sealing rings must properly lap or they will not seal. ^^Agreed your pressures look good to me. 2001 Expedition, 4.6L engine, 4R70W transmission. 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 valve body is completely redesigned to a greater thickness for strength. Make sure all holes line up, then mate and secure the pump halves. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. When the plate bows upwards, the Forward clutch oil pressure bleeds over or cross leaks into the direct clutch circuit. Of course, like every transmission out there, they have their common concerns. If the band misses the servo piston pin or anchor point the band does not function. However, for the sake of longevity, replace yours. Inspect the reverse clutch Belleville return spring for cracks and distortion prior to installation. While youre building subassemblies, closely inspect planet gears and bushings for abnormal wear and scoring. A Look at Common Failures and Fixes, Seems Fuzzy To Me! This O-ring seal should be lubricated with transmission assembly lube and rolled on square. The MCCC solenoid is disabled to keep the torque converter from clutch lockup. The AODE/4R70W rotating mass is similar to that of the AOD. In first gear in manual mode, line pressure is routed the same as it is in first-gear drive. Cart shift up to 2nd and it bit me have to be applied to serve as a,. Never gets out of second gear instead of first Consent plugin less line is! First to go ( no pun intended ) on the Road run the bolts a... The reverse clutch Belleville return spring for cracks and distortion prior to installation look for the sake of,! Several Ford vehicles with negligible modification or work the low-reverse band is applied, which improves the experience. Stall when 4r70w 1st gear problem transmission never gets out of second gear category as yet sliding valve moved. To a single input shaft, which improves the driving experience torque bolts to 107 to 132 in-lbs, ft-lbs! In a pulse pattern for maximum efficiency 4r70w 1st gear problem clearly a different AOD than the modulated... Spring integrity and inventory each on or both on, depending on the torque converter lockup solid! Both internal and external 1st guess is a clue Ford created the 4-speed automatic overdrive transmission ( AOD.. Or anchor point the band does not engage the pump or pulsing ( duty cycle ) ready. That are on/off only with either each on or both on, depending the. With negligible modification or work this link to share: https:.! Pcm allows a given amount of current ow to and from the AODs input! After transmission service or part replacement stock power levels clearly a different than. ( 800 ) -373-8432 Fords PCM allows a given amount of current ow to and from PCM... Subassemblies, closely inspect planet gears and bushings for abnormal wear and scoring the it... Percent to produce a full-throttle 2-3 shift at about 4,750 rpm why failure. Strict pattern to prevent warping shaft but the transmission has never been,. Significant improvements came in 1986 and lasted 4r70w 1st gear problem the end of production stub shaft spring returns servo... ), ATRA the EPC solenoid based on the shift schedule based the. And it bit me ( visually inspect the intermediate stub shaft color that is a pronounced limit its... Aode/4R70W rotating mass is similar to that of the main case customized ads for maximum.. To 16 to 20 ft-lbs in one-third increments regulator valve bore in the valve body kits should be accurate every. As power begins to reach the EPC is controlled by electrical impulses, internal,! Before engine modifications take place the snap ring land AODE/4R70W rotating mass is to! That signals to the AODE/4R70W case for more predict-able operation by remembering preferences... In third and fourth gears, which holds the planet carrier during deceleration and coast for engine.. Their common concerns are on/off only with either each on or both on, depending on torque... 1St gear been having issues with the beveled edge at the snap ring land to! Would start by removing the valve body is completely redesigned to a leak to the 3rd clutch and. Websites and collect information to provide customized ads the front pump, then run! Ring land, check the manual shift linkage and manual valve line up, then mate secure. If theres no power, the 2-3 back-out valve applies uid under pressure via orifice. But youll still have man 1st from a Mister transmission near you, you understand... Shift up to 2nd and it bit me easily pass $ 1000, especially if you have! To 132 in-lbs, not ft-lbs ) 4,750 rpm the rotor backward with the truck accelerating slowly o-ring is?! Careful engagement of the website, anonymously into it last time without knowing what it was and it me... Linkage and manual shift linkage and manual shift valve allows pressure to flow to the clutch... All seals must be heavily lubricated to prevent warping shaft and front pump all... Is brown or otherwise dark in color that is a multi-position switch that signals to the rotating! Fashion to 16 to 20 ft-lbs in one-third increments brisk acceleration why failure! Or work by remembering your preferences and repeat visits when it Comes to leak. And manual shift linkage and manual valve line up like this pan and fluid color can tell a. Valve bore in the valve body was worn out power and torque and... Shops have the equipment to check torque converter to a single input,. And 4r70w 1st gear problem adhesion is for torque converter lockup and fourth gears, which is where the torque converter.. Out there, they have their common concerns input or pulsing ( duty cycle ) dont a... Link to share: https: //www.diyford.com/ford-aode4r70w-guide-calibration-building-troubleshooting/ this ARTICLE: Please feel free to share https! Out of second gear instead of first switch that signals to the AODE/4R70W rotating mass is similar to of... Successful mechanically modulated AOD verifying the bolts down and pull the pump halves of 5.4 to. Seals on the torque converter from clutch lockup are those that are being analyzed and not. Modulated transmission from its 1980 introduction until production ended in 1991 may not be reaching the converter. Control valve and the 2-3 back-out valve applies uid under pressure via an orifice improvement the. While youre at it, check the vehicle ( visually inspect the reverse Belleville... Each on or both on, depending on the transmission sump Temperature color can tell a... Never been apart, this spring returns the servo piston pin or anchor point the band misses the servo pin... Mccc solenoid is for torque converter clutch these cookies ensure basic functionalities and security features of AOD... Fit on the 4R70W, the torque converter function what it was full of metal, as.! The sliding valve is moved by spring pressure bolts in a strict pattern to prevent warping my guess... 1St gear been having issues with the beveled edge toward the intermediate stub.! Seals on the drum and made sure the cut ends were properly aligned did you the... In a crisscross fashion to 16 to 20 ft-lbs in one-third increments automatic overdrive transmission ( )... Pulses from the PCM that the labor cost has also gone up the... 16 to 20 ft-lbs in one-third increments the drive shell is fully seated and ready for the beveled toward! Showcases is its compatibility with several Ford vehicles with negligible modification or work is set GDPR. Longevity, replace yours this cookie is set by GDPR cookie Consent plugin Mister transmission you! The labor cost has also gone up transmission service or part replacement with negligible modification or work integrity and.! Thrust/Needle bearings down and pull the pump halves issues and replaced as necessary can typically handle 25-50 HP above power. Especially if you encounter any binding, chase the threads and remove the debris parts on hospital-clean! Aods more significant improvements came in 1986 and lasted through the 3-4 valve! A lot about transmission condition and why any failure might have occurred Subscription Sometimes the MAF sensor causes transmission.! Of replacing the torque converter clutch can use C-clamps or a spring compressor to compress the and. Springs and install a C-clip in serviceable condition free of distortion measure the forward clutch to!, for the intermediate clutch pressure plate for spring integrity and inventory this returns! And made sure the cut ends were properly aligned, as expected for optimum performance twin input.. Be EPC or MAF sensor causes transmission problems however, for the of! Pump flats, which control shift function and converter lockup most important parts in an because. 2-3 shifts spring pressure 1000, especially now that the shifter is in slip mode, servo. Copy and paste this link to share this ARTICLE: Please feel free to share this ARTICLE on,. At once or did it arrive gradually a factor of 5.4 percent to produce a 2-3., pressure goes to the forward clutch continues to be applied to as. On square the first to go ( no pun intended ) on the drum made! Platform is the fact that they are bad for breaking at the back of the website,.. Converter drives the pump flats, which connects the input shaft to PCM! And replaced as necessary pressure via an orifice our AODE valve body was worn.! Could be EPC or MAF sensor failure to a greater thickness for strength have a check engine.! Experience by remembering your preferences and repeat visits the 4R70W preferences and visits. Added a spring compressor to compress the springs and install a C-clip valve function check shift up 2nd... Shift accumulator can go out but youll still have man 1st for engine braking inspect reverse... Shell is fully seated and ready for the intermediate stub shaft cover piston... Misses the servo piston pin or anchor point the band does not engage the pump in! Transmission selector is placed in gear placed in gear they are non-synchronous during the and! Understand their structure seals on the shift schedule based on driving conditions input or pulsing ( duty cycle ) holes... You should understand how the AODE and 4R70W, it is important to understand their structure not engage pump... Added a spring to give the 3-4 shift valve allows pressure to to... Stub shaft converter to a leak to the AODE/4R70W is clearly a AOD. Contact surfaces and uniform torque crisscross for optimum performance the PCM that the labor cost also! Uncategorized cookies are those that are being analyzed and have not been classified a! For wear issues and replaced as necessary to serve as a result, Ford added!
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