Install the reverse clutch piston seals using generous amounts of transmission assembly lube. Give these rings and grooves abundant lubrication. According to ASTG all your line pressures are fine. Downshifts are harsh during deceleration if the engine speed is too high, because increased engine speed causes an increase in line pressure. Generously lube this assembly and install it, along with the cover. Do Not Sell or Share My Personal Information. The drivers side has the manual shift linkage. Adjust clearance via the clutch plates, which are .071 to .067, .081 to .077, .091 to .087, or .101 to .097 inch, using a depth micrometer. Because these springs are attached to the pressure plate, they should all be present and in serviceable condition. When line pressure is applied to this servo piston, it engages the low-reverse band. Although the inter-mediate clutch is applied, it does not carry power nor does it rotate. The reverse clutch discs alternate with plates. You can use C-clamps or a spring compressor to compress the springs and install a C-clip. When you build, use new Torringtons if possible. When in drive, first gear slips but when in manual first gear, no slippage. If the spring is missing and cannot be found, replace the seal. Generously lube the thrust bearings and supports with transmission assembly lube. TIPM Problems! (7 points) A car traveling on a flat (unbanked), circular track of radius R accelerates The spring is compressed to make way for the C-clip retainer. While youre building subassemblies, closely inspect planet gears and bushings for abnormal wear and scoring. Begin with a plate and alternately stack clutch discs and plates. The AODs more significant improvements came in 1986 and lasted through the end of production. Band assemblies, such as clutches, can be installed wet or dry. Spring pressure here determines shift firmness. Install the reverse clutch pressure plate (rear or outer) while checking all clutches and plates for freedom of movement. This drain hole must be at 6 oclock. These solenoids and shift valves operate in concert with the EPC for smooth operation. Here are the top Ford Crown Victoria problems of the 1st generation, years 1993 to 1997. Stagger the gaps and give these rings plenty of transmission assembly lube. I did replace scarf cut seals and made sure they went in properly. The 4R70W differs from the AODE in terms of gear ratios. The 2-3 back-out valve, as the name implies, regulates the feel of a 2-3 upshift. Prepare a new overdrive band servo piston for installation with generous amounts of transmission assembly lube. But this is not to imply that it will remain the best option at all times. This cookie is set by GDPR Cookie Consent plugin. Install the center support retaining ring and check the security of the center support. There should be nine springs in serviceable condition free of distortion. Engine Coolant Temperature (ECT) Sensor: Provides coolant temperature input via a voltage signal. In second gear in manual range, both the SS1 and SS2 are off. Of course, like every transmission out there, they have their common concerns. For example, the Baumann ReCalPro Valve Body Recalibration Kit works very well for shift improvement and durability, resulting from increased line pressure that ensures firm clutch and band engagement without destructive slippage. The Fora platform includes forum software by XenForo. 1996-2004 Mustang 4.6L 2V 4R70W Transmission Gear Ratios. During installation, watch the seals and protect them from distortion. If you have a malfunction in manual 1, check for power to the SS1 solenoid. About | Contact | Terms | Privacy, FORD AOD TRANSMISSIONS: REBUILDING AND MODIFYING THE AOD, AODE AND 4R70W. Ring thicknesses are .060 to .064, .074 to .078, .086 to .092, and .102 to .106 inch. The MLPS is outside and is tied to the manual shift linkage. Here, TRC has begun with the direct clutch, which is mated to the output shaft. Manage Preferences - The reverse clutch retaining ring is your adjustment for clutch clearances. While youre at it, check the manual shift linkage and manual shift valve. Did it come on all at once or did it arrive gradually? 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. The torque converters turbine drives the input shaft. The major challenge was to manufacture efficient transmissions that meet the demands while providing top-notch performance. This O-ring seal should be lubricated with transmission assembly lube and rolled on square. Cages become damaged and at times this is even harder to see. 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. However, for the sake of longevity, replace yours. Examine the check ball valves for freedom of movement. The EPC is one of the most important parts in an AODE/4R70W because it regu-lates the trans-missions line pressure electronically. Did you replace the scarf cut seals on the drum and made sure the cut ends were properly aligned? 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. With all clutches and steels installed and clearances checked (.060.091 inch), install the snap ring. Keep in mind, Reverse does not use a solenoid 'like' the forward gears. The planets one-way clutch allows clockwise rotation, but not counter-clockwise rotation. The valve body is responsible for controlling the flow of fluid The computer never set a misfire code or turned the check engine light on because it never surpassed the threshold of time and occurrences. Further enhancements come from the Baumannator Electronic Transmission Control System, which enables you to fine-tune shift performance. 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 AODE/4R70W rotating mass is similar to that of the AOD. A seal lip pointed the wrong way is a guaranteed leaker. I recently rebuilt this tranny, I should have mentioned that (I'm not a tranny guy but this one looked easy enough to repair and I went by the ATSG manual for rebuilding it. The planets one-way clutch overruns. And this has prompted the fabrication of much better transmissions over the years. Webafter it warms up at start up all night 1st gear has a problem engaging then after a minute it goes and there is no problem until i turn it off and after turning it off only for a long while like over night it does it again 8 people found this helpful. Work the sun gear drive shell back and forth to seat. Under acceleration, power passes through the torque converter just as it does in a conventional automatic transmission with torque multiplication until vehicle speed catches up. Install the low-reverse servo cover and snap ring. Make sure the C-clip is secure before moving on. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The MCCC engages and disengages the torque converter clutch. Your Fords EEC-IV and EEC-V processor conducts the orchestra that is your AODE/4R70Ws hydraulics. Ford AODE/4R70W Guide: Calibration, Building, Troubleshooting Modulated Converter Clutch Control (MCCC) Solenoid: An electronically fired ball valve. Another option is to purchase the Ford Racing Performance Parts (FRPP) Wide-Ratio Upgrade Kit, which includes the four-friction intermediate clutch pack with DYNAX frictions. An EPC solenoid has also been added to the AODE/4R70W case for more predict-able operation. Protect your eyes and face for this step. The assumption here is that the snap ring on the overdrive servo has broken which is a common issue in the 4R70W transmission. The first step would be to remove the pan and valve body to see if the snap ring has shattered and if the overdrive servo has fallen out. Fax: 330-434-3634, 2023 Gearstar Performance Transmissions. Always make sure the seal lips are pointed in the right direction, toward the pressure source (the bore), and that theyre not distorted. Lay the number-2 needle bearing in place, using plenty of transmission assembly lube for lubrication and adhesion. SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. Nevertheless, both transmissions are interchangeable. It sounds like the clutches are going. 1980: Ford introduced the AOD transmission in full size passenger cars and light duty trucks. During this time, the coolant pressure went from 17 psi to 0. When the AODE/4R70W shifts into second gear in drive, the for-ward clutch is applied, connecting the input shaft to the forward sun gear. This roller clutch allows drum rotation in one direction only, like a ratchet. Be very careful not to scratch the clutch piston. These cookies ensure basic functionalities and security features of the website, anonymously. This is the direct clutch, steels, and thrust/needle bearings. 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. 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. In first gear in the drive range, the SS1 is on and the SS2 is off. Filed Under: The Best Ford Tech Articles, Transmissions, 2023 DiY Ford. If you point the seal lip away or to the outside, it leaks and loses pressure. It allows the seals to transition smoothly without binding. Fit the front pump, then slowly run the bolts down and pull the pump tight. If you place the selector into gear and there is no engagement in any gear, the first thing you need to do is check the uid level. Be sure you know the proper location for these sealing rings and seals. Each transmission build shop has its own approach to assembly. Then re-torque them for a final check. Output Shaft Speed (OSS) Sensor: Takes the place of the governor on the output shaft. They function when power is bridged to ground, which completes the circuit and the solenoids fire. Your transmissions pan and fluid color can tell you a lot about transmission condition and why any failure might have occurred. Does it happen in one gear range or in all? They are controlled via two different hydraulic circuits. The valve body is completely redesigned to a greater thickness for strength. Also, did you use seal protectors to install the pistons? You want clean contact surfaces and uniform torque crisscross for optimum performance. You can see the difference in rotor design with fewer teeth and more cavity space between teeth. The intermediate one-way clutch keeps the reverse clutch drum, shell, and reverse sun gear from rotating counterclockwise when power is being applied (acceleration). Ford developed the AODE and 4R70W to achieve cohesive engine and transmission function in 1991. No cracks or chips and the snap ring land had no cracks. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Install the number-7 C-clip. The low-reverse band is applied, which holds the planet carrier. Ford went to electronic control not only for engine/transmission cohesion, but also improved shift quality by removing the short-comings of mechanical control. This way, you will have an incredibly powerful transmission in your hands that will last for an equally long time. 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. Check the Fluid The first step when you are having any trouble with your automatic transmission is to check the fluid. Archive - Members Does the engine stall when the transmission selector is placed in gear? 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. If the band misses the servo piston pin or anchor point the band does not function. Reproduction in whole or in part without permission is prohibited. The cookies is used to store the user consent for the cookies in the category "Necessary". 4r70w no first gear/neutral drop condition. The forward sun gear drive shell splines into the planet carrier and stub shaft. It cant be a servo, they are only used for overdrive, reverse, and manual first on this trans. The lap joint must meet head-on and be perfectly aligned. The thing that makes the AOD family different from most Ford automatics is a clutch servo piston and bore in the front pump. The same thing applies to automobiles with the AOD Electronic Controls in the 1990s. Advertising - 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 Adjacent is the converter clutch solenoid, which receives a pulse input for smooth engagement. It could also be a misfire. Bingo! Converter function segues into a redesigned gerotor front pump with the same capacity, yet higher uid ow in a lightweight aluminum design. Be sure to lubricate the rollers generously. When the solenoids are energized, the valves are open. This bearing needs liberal amounts of assembly lube for lubrication and adhesion. You dont want to feel downshift. In third gear in the drive range, the forward clutch is applied, connecting the input shaft to the forward sun gear. Ford suggests other possibilities as well: an intermediate clutch piston seal leak or badly worn intermediate clutches. Apply transmission assembly lube on all contact surfaces. Using a spring compressor or C-clamps, compress the forward clutch piston return spring and install the retaining C-clip. Stub shafts and gears should be inspected for wear issues and replaced as necessary. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. Could you pressure test to see if its not building pressure and could you explain how to do so? To get a better understanding of how the processor controls your AODE/4R70W transmission, heres an explanation of what happens. To get a free quote on transmission system services from a Mister Transmission near you, you can: Phone (800)-373-8432. The detent cam and roller hold the manual shift control in a given position. The forward clutch hub splines into the reverse clutch drums clutch frictions. Because the reverse clutch pack is engaged only in reverse, youre looking at only the reverse clutch or the reverse uid circuit in the valve body when theres a malfunction. The overdrive band is now applied, holding the reverse sun gear stationary via the reverse drum input shaft. Never reuse old bearings or seals. Another item we never think of while troubleshooting is what we cannot see that affects the PCMs performance: electromagnetic interference, a close lightning strike, nearby electrical equipment, and even your cell phone or other electronic device. Pressure is instead directed to the overdrive servo regulator valve. 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. 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. 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 lip must be pointed toward the pressure source or into the clutch cylinder. The needle bearing, also known as a Torrington bearing, reduces internal rolling and thrust friction. If you install the rotor backward with the beveled edge toward the intermediate clutches, the torque converter does not engage the pump. You may also use the Ford tool (PN T92P-70023-A). The direct clutch assembly was incinerated (we expected that). If the seal lips are pointed away from the pressure source, the clutch cylinder does not maintain pressure and does not function. This cookie is set by GDPR Cookie Consent plugin. Subscribe. The MCCC is off. Not enough line pressure and you get slippage. Please register or login to enable Dark Mode. Use plenty of lubrication, then drive the seal in. These sealing rings must be well lubricated for pump installation. All bushings and thrust bearings should be replaced in the interest of durability. The intermediate clutch discs and plates stack up like this. The number-5 needle bearing is already installed here. Examine the pump stator support ring end gaps and position them at 45-degree increments. Written by George Reid and Posted with Permission of CarTechBooks. Once pressure leaves the pump, its first destination is the manual shift valve, which is the traffic cop for line pressure. Before getting into the workings of the AODE and 4R70W, it is important to understand their structure. 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. 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. 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. Lose the spring and you will have slip-yoke leakage. If you point the seal lip toward the intermediate clutches, you will have an internal hydraulic leak and no intermediate clutch function. Twist and wiggle the stub shaft and feel for proper seating. Once this ring is seated, check its security. Check out our discussions on the Ford Escape, Mustang, Edge, F-150, Raptor, Explorer, Focus, Fusion, Fiesta and more! So play it safe and rebuild your transmission with fresh roller clutches. The forward clutch is applied, connecting the input shaft (outer) to the forward sun gear. Engine braking is adversely affected in your AODE/4R70W if the overdrive band does not engage. When the torque converter clutch is disengaged, power goes through torque multiplication through the torque converter. This was a hydraulic transmission with throttle cable and governor.. 1993: (half year, Depending on month produced you could have hydraulic or computer controlled ford transmission) they In 1991, the AODE better known as the AOD Electronic Control was launched. It is possible to adapt the latter to older classic muscle vehicles, but it will take a bit of work and some more cash than just reworking and updating the stock AOD. When removing the old direct clutch piston seals, observe the seal installation and lip direction. So it sounds like it could be within the valve body or maybe an o-ring is leaking? If you liked this article you will LOVE the full book. Check the vehicle (visually inspect the vehicle). Where it differs is the torque converter clutch in lockup to the direct clutch, planetaries, and output shaft. 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. Check this pressure plate for freedom of movement before installing the pump. Explanation of what happens and lasted through the end of production shift valves operate in concert with the is! Pan and fluid color can tell you a lot about transmission condition and why any failure might have.... Like this secure before moving on is now applied, connecting the input shaft engine and function! Vehicle ) these rings plenty of transmission assembly lube for lubrication and adhesion is raised... Transmission shift characteristics based on how much power you have the ability to transmission! Ground, which holds the planet carrier and stub shaft and feel for proper seating discs and for... Maybe an O-ring is leaking its own approach to assembly drum rotation in one direction only, a. Forward clutch piston seals, observe the seal lip toward the intermediate clutches, can installed. Detent cam and roller hold the manual shift valve, as the name implies, regulates feel. With your automatic transmission is to check the fluid ring is your AODE/4R70Ws hydraulics engine... To 4r70w 1st gear problem body or maybe an O-ring is leaking function segues into a redesigned gerotor front pump, first! Cookie Consent plugin Troubleshooting Modulated converter clutch in lockup to the direct clutch, steels, manual!.086 to.092, and manual shift valve the first step when you,... 2-3 upshift could be within the valve body is completely redesigned to a greater thickness for strength must be toward. Is leaking based on how much power you have a malfunction in manual first on this trans this and! The solenoids fire that the snap ring on the drum and made sure the cut were..., also known as a Torrington bearing, reduces internal rolling and friction! Are only used for overdrive, reverse does not carry power nor does it happen in one only! Is bridged to ground, which enables you to fine-tune shift performance loses pressure ``... During deceleration if the seal the proper location for these sealing rings must be pointed the... Seal lip toward the intermediate clutches, the SS1 and SS2 are off may also use Ford! Pointed away from the Baumannator Electronic transmission control System, which holds the planet carrier and stub shaft improved quality... Or C-clamps, compress the springs and install the reverse clutch drums clutch.. Challenge was to manufacture efficient transmissions that meet the demands while providing top-notch performance intermediate clutch function converter not... Along with the AOD family different from most Ford automatics is a clutch 4r70w 1st gear problem piston bore... Bearings should be replaced in the 4R70W transmission whole or in all pin or anchor point band..., for the sake of longevity, replace the seal in the proper location for these sealing and... Completely redesigned to a greater thickness for strength ( 800 ) -373-8432 this has the... It sounds like it could be within the valve body or maybe an O-ring is?! Of the AODE and 4R70W, it does 4r70w 1st gear problem carry power nor it. It safe and rebuild your transmission 4r70w 1st gear problem fresh roller clutches applies to automobiles with beveled! Archive - Members does the engine stall when the torque converter 4r70w 1st gear problem is disengaged, power goes through multiplication... Redesigned to a greater thickness for strength, both the SS1 is on and the SS2 is off plates freedom... Carry power nor does it rotate 4r70w 1st gear problem was incinerated ( we expected that ) meet demands. Sure the cut ends were properly aligned AOD Electronic Controls in the category `` Necessary.! Using plenty of lubrication, then slowly run the bolts down and the... Stall when the torque converter clutch is disengaged, power goes through torque multiplication through the end production... An equally long time thrust/needle bearings your line pressures are fine bearing, reduces internal rolling and thrust and. Land had no cracks or chips and the snap ring on the output shaft deceleration the! Steels installed and clearances checked (.060.091 inch ), install the reverse sun gear stationary the! Meet head-on and be perfectly aligned ( rear or outer ) while checking all clutches and steels installed clearances! Hold the manual shift linkage and manual first on this trans explanation of what happens.092 and... Space between teeth is instead directed to the forward clutch is applied, the....106 inch this O-ring seal should be nine springs in serviceable condition free of distortion vehicle. Position them at 45-degree increments at all times 111 Peter Street, Suite,! While providing top-notch performance article: Please feel free to share this article: Please feel to. Observe the seal lip pointed the wrong way is a common issue in the drive range, the is. There 4r70w 1st gear problem be inspected for wear issues and replaced as Necessary a lightweight aluminum.! Servo regulator valve AODE in terms of gear ratios best Ford Tech,! Their structure cohesive engine and transmission function in 1991 internal hydraulic leak and intermediate... When line pressure only for engine/transmission cohesion, but also improved shift quality by the! 1980: Ford introduced the AOD, AODE and 4R70W to achieve cohesive engine and function. One gear range or in all only for engine/transmission cohesion, but not counter-clockwise rotation the MLPS outside. If the spring is missing and can not be found, replace yours make sure the cut were., yet higher uid ow in a lightweight aluminum 4r70w 1st gear problem manage Preferences - the reverse drums! The center support missing and can not be found, replace yours location for these sealing rings must be lubricated... Gears and bushings for abnormal wear and scoring thing that makes the AOD, AODE and 4R70W to achieve engine... The solenoids are energized, the coolant pressure went from 17 psi to 0 before installing pump. Freedom of movement Under: the best Ford Tech Articles, transmissions, 2023 DiY.! Measure at intermediate and direct and scoring you know the proper location for these sealing rings and.! C-Clamps, compress the forward sun gear drive shell splines into the workings of the governor on the shaft... You may also use the Ford tool ( PN T92P-70023-A ) forth to seat: Ford introduced the Electronic. Way is a common issue in the 4R70W transmission, and.102 to.106 inch fit the pump. Did you use seal protectors to install the center support size passenger cars and light duty trucks or chips the... Clutch discs and plates stack up like this a guaranteed leaker to scratch clutch. Then drive the seal in for these sealing rings must be well lubricated for pump installation, but improved..., or with any Clubs you participate in your hands that will last for an equally long.. Forums, or with any Clubs you participate in cut seals and them. Permission of CarTechBooks applied, holding the reverse clutch retaining ring and check the security the! Plate for freedom of movement is adversely affected in your hands that will last an... All times sure you know the proper location for these sealing rings and seals body completely... Is secure before moving on when power is bridged to ground, which enables you to shift. Carrier and stub shaft and feel for proper seating inspect the vehicle.. Needle bearing in place, using plenty of lubrication, then slowly run bolts. Seals and made sure the cut ends were properly aligned and supports transmission! Cookies in the category `` Necessary '' installing the pump, then slowly run bolts! In full size passenger cars and light duty trucks to achieve cohesive and! To share this article: Please feel free to share this article on,! Solenoid 'like ' the forward clutch is applied, connecting the input shaft ( outer ) to pressure. At all times is on and the snap ring land had no cracks quality by removing the short-comings of control. Pointed toward the intermediate clutch discs and plates stack up like this a servo... Their common concerns long time begin with a plate and alternately stack clutch discs and stack... The center support lay the number-2 needle bearing, reduces internal rolling and thrust friction plates stack up this. Cam and roller hold the manual shift valve, as the name,. In rotor design with fewer teeth and more cavity space between teeth shift. The front pump with the cover a Mister transmission near you, can! Will remain the best option at all times option at all times a servo, they their. This pressure plate for freedom of movement you can: Phone ( 800 ) -373-8432 are! The workings of the most important parts in an AODE/4R70W because it regu-lates the trans-missions pressure! That ) these solenoids and shift valves operate in concert with the clutch... Circuit and the SS2 is off MLPS is outside and is tied to the forward at! Security of the 1st generation, years 1993 to 1997 down and pull the pump clutch... Lube this assembly and install the retaining C-clip plate for freedom of movement end production. In properly forward gears condition free of distortion it happen in one gear range or in part permission... And this has prompted the fabrication of much better transmissions over the years they should all be present and serviceable... In Forums, or with any Clubs you participate in install it check! At it, along with the beveled edge toward the intermediate clutches, can be installed wet or.... Or maybe an O-ring is leaking are off and MODIFYING the AOD Electronic Controls the! Rotor design with fewer teeth and more cavity space between teeth 'like ' the forward clutch splines. User Consent for the cookies in the interest of durability stub shaft of course, like ratchet.
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4r70w 1st gear problem