2.7K views 3 years ago. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. If these seal ends overlap, you get internal leakage. Diagnose the problem (accurately diagnose). Inspect the intermediate clutch pressure plate for spring integrity and inventory. And for this to happen successfully, the manufacturers had to sacrifice a handful of the speed and performance features that older models exhibited. When you apply pressure to this piston it acts on the intermediate clutch pack. Cookie Policy - Use plenty of lubrication on the center support bushing. In this edition of our special Violence in Chicago series, NBC 5s Stefan Holt sits down with a group of Chicago teens to discuss the struggles they face on a daily This is the Manual Lever Position Sensor (MLPS), which is tied to the manual shifter. Be very careful not to scratch the clutch piston. 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. Install the low-reverse band servo piston return spring. Check this ring carefully for proper seating. The pressure regulator valve bore in the valve body was worn out. Modulated Converter Clutch Control (MCCC) Solenoid: An electronically fired ball valve. 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? Copyright 2006-2020 GEARS Magazine. Clutch clearances should be .040 to .059 inch. Any seal bind is a guaranteed leak. Because these springs are attached to the pressure plate, they should all be present and in serviceable condition. 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. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. If the seal lips are pointed away from the pressure source, the clutch cylinder does not maintain pressure and does not function. The EPC solenoid controls line pressure based on PCM input (driving conditions). It is unknown how many cycles a Belleville spring can take before it breaks. Roller clutches should always be replaced; consider it good life insurance. You may also use the Ford tool (PN T92P-70023-A). So play it safe and rebuild your transmission with fresh roller clutches. 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. Re: 4R70W tcc lock up in 1st gear. This cover contains line pressure at the 1-2 shift accumulator. The identification plate includes the serial number, assembly number, model year, model, and engine size. Make sure the old filter seal has been removed, which is an easy item to overlook. When the plate bows upwards, the Forward clutch oil pressure bleeds over or cross leaks into the direct clutch circuit. It allows the seals to transition smoothly without binding. This O-ring seal should be lubricated with transmission assembly lube and rolled on square. Accelerating those 20 mph in 1st gear instead of 2nd gear would get me faster time, but for that, I need to stop the slip by engaging the TCC. The reverse clutch retaining ring is your adjustment for clutch clearances. The main control pilot bolts receive 140 to 160 in-lbs (not ft-lbs). The drive shell is fully seated and ready for the intermediate stub shaft. Instead, the problem is with the low servo modulator valve, low-reverse band servo, number-6 shuttle ball, or a failed low-reverse band. Stub shafts and gears should be inspected for wear issues and replaced as necessary. A modified version of the AODE was launched in 1993, but with a different name. The forward sun gear drive shell splines into the planet carrier and stub shaft. The AODs more significant improvements came in 1986 and lasted through the end of production. Begin with a plate and alternately stack clutch discs and plates. You get high line pressure when the throttle is wide open and manifold vacuum is low under hard acceleration. GearStar Performance Transmission The next items to check are the number-3 and number-4 sealing rings. 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. If you point the seal lip in the wrong direction, it does not hold pressure and the clutch pack does not work. These cookies ensure basic functionalities and security features of the website, anonymously. Its a good idea to pack a spring-loaded seal with transmission assembly lube, which keeps the spring contained. The front pump gasket has been located and all passages and bolt holes checked for proper alignment. The AOD full-throttle shift-point with the Motorsport wide-ratio gear-set is different. All of these items are checked by dropping the valve body and visually inspecting them. No cracks or chips and the snap ring land had no cracks. This cookie is set by GDPR Cookie Consent plugin. Mark helpful 40 Precision-machined aluminum spool valves provide weight reduction and a more precise fit. The gaskets and seals are also potential leak and pressure-loss points. The plates should have been resurfaced or replaced. When the solenoids are energized, the valves are open. To get a free quote on transmission system services from a Mister Transmission near you, you can: Phone (800)-373-8432. It is recommended that you replace the bushings and all steel clutch plates while youre in there. 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. In other words, are the two pump halves securely tightened? Car manufacturers began to wise up in the 70s and started manufacturing fuel-efficient vehicles. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction. If you have no engine braking in manual 1, the problem isnt electronic. Install the reverse clutch pressure plate (rear or outer) while checking all clutches and plates for freedom of movement. This is the forward sun gear stub shaft splined into the planet carrier with the number-5 needle bearing installed. But opting out of some of these cookies may affect your browsing experience. We also use third-party cookies that help us analyze and understand how you use this website. Pump assembly must be performed meticulously with clearances checked. Do Not Sell or Share My Personal Information -, By logging into your account, you agree to our. The MCCC is off (on the torque converter, no lockup). Band assemblies, such as clutches, can be installed wet or dry. It does what the governor did hydraulically. In reverse, the SS1 is on and the SS2 is off. If you get a harsh 2-3 upshift, the problem is likely the 2-3 accumulator or excessive line pressure. By clicking Accept, you consent to the use of ALL the cookies. 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. I just jumped into it last time without knowing what it was and it bit me. This is the direct clutch, steels, and thrust/needle bearings. The original problem was no reverse, which is fixed, but now I have this problem with first gear. Although these clutches are dry, some transmission professionals prefer to soak them in transmission fluid first to get accurate clearances and the best results. The needle bearing, also known as a Torrington bearing, reduces internal rolling and thrust friction. Darkness indicates contamination and overheating. The AOD efficiently replaced several older transmissions that Ford put out, including the C4, C5, and FMX. Further enhancements come from the Baumannator Electronic Transmission Control System, which enables you to fine-tune shift performance. 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. Carefully install the direct clutch piston using a seal installation tool to protect the seal lip. The planetary one-way clutch overruns. Pressure from the manual valve continues to pass through the 2-3 shift valve, releasing the overdrive band servo. Is there any tests I can do without pulling the trans first? It also means theres no pressure to the intermediate clutch pack. The EPC is controlled by electrical impulses, internal pressure, and spring pressure. Ford developed the AODE and 4R70W to achieve cohesive engine and transmission function in 1991. Make sure you have plenty of lube and smooth piston travel. Install the number-9 needle bearing in the case, using transmission assembly lube. The 2-3 shift accumulator assembly contains and builds pressure for a firmer 2-3 upshift. The detent cam and roller hold the manual shift control in a given position. The direct clutch hub goes up against the number-7 thrust bearing. Powertrain Expo The MLPS is a multi-position switch that signals to the PCM what gear range the transmission selector is in. Account. This cookie is set by GDPR Cookie Consent plugin. If the SS2 isnt energized, there is a 1-2 upshift, but the transmission never gets out of second gear. I did replace scarf cut seals and made sure they went in properly. The MCCC gets pulsing signals from the PCM. During deceleration or coast, you want low line pressure for a smooth upshift/downshift. The 4R70W also requires consistent maintenance, just like its predecessors.This way, you will have an incredibly powerful transmission. Erratic shifting One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. It was not on the floor, so we figured the head gaskets were to blame. WebThe 2001 4r70w first and second gear shift problems were caused by a design flaw in the transmissions valve body. As far as the seal protectors, I didn't know there was such a thing honestly. But when we checked the coolant for exhaust gases, there wasnt any. When in drive, first gear slips but when in manual first gear, no slippage. Again, some professionals opt for soaking the frictions in transmission fluid while others do not. Weak or soft engagement in any gear indicates insufficient line pressure from the source or leakage at clutch pistons or band servos. Advertising - 4r70w no first gear/neutral drop condition. Remove the pan and inspect the filter. Use a seal protection tool to install the intermediate clutch piston installation. 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. I would recommend searching for a download of the "ASTG Update Handbook: aode, 4r70w, 4r70e, 4r75e" for test pressure info and port locations. You can copy and paste this link to share: https://www.diyford.com/ford-aode4r70w-guide-calibration-building-troubleshooting/. Baumanns Torque-Compensation feature tunes the transmissions hydraulic control to the engines power characteristics. The uid pressure is the same as second gear in drive range. 2001 Expedition, 4.6L engine, 4R70W transmission. Privacy Policy. There are four possible combinations of valve operation to obtain a given result. As mentioned earlier, no stock transmission is perfect in every aspect. Fluid under pressure may not be reaching the torque converter clutch piston. About Us - There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. The converter clutch control solenoid is then controlled by the PCM. Protect your eyes and face for this step. The reverse clutch discs alternate with plates. To better tie the engine, vehicle, and transmission functions together, Ford went to an output shaft speed sensor and manual shift lever sensor, along with a multiplex electrical connector to simplify service. Also install the input shaft sealing rings at this time. Lose the spring and you will have slip-yoke leakage. First gear, the solenoid A and the pressure control solenoid PCS involved. Of course, like every transmission out there, they have their common concerns. Pressure ows to the direct clutch and the 2-3 accumulator through the 2-3 backout valve. 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. WebATP has released 25 new numbers in the Powertrain category including Automatic and Manual Transmission Shift, Detent, Accelerator and Clutch Cables, along with Automatic The overdrive band is applied, holding the reverse sun gear stationary to facilitate engine braking. Yet another issue could be the low-reverse one-way clutch. Ford went to electronic control not only for engine/transmission cohesion, but also improved shift quality by removing the short-comings of mechanical control. If theres no power to the EPC, you get maximum line pressure holding the valve all the way in. This center support carries the planet carrier. And finally, torque converter clutch function can be full on, full off, or a smooth engagement, which is controlled by the MCCC. It wasnt all that different from the FMX 3-speed automatics since common FMX components such as the Ravigneaux gear train, etc. Spring pressure here determines shift firmness. You dont want to feel downshift. Electronic Pressure Control (EPC) Solenoid: Your AODE/4R70Ws pace-maker. Bucko133. The AODE/4R70W employs a different main case and valve body along with an aluminum front pump and electronic control. The planet carrier splines inside the ring gear with gentle back-and-forth twisting to achieve proper engagement. 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. And since then, several regulations and rules to considerably improve the quality of air and fuel efficiency have been published. Change Your Address, Yes, I would like to receive emails from Gears Magazine. This bearing needs liberal amounts of assembly lube for lubrication and adhesion. 800 ) -373-8432 lips are pointed away from the manual valve continues to through. 70S and started manufacturing fuel-efficient vehicles transmission system services from a Mister transmission near,. Shift control in a given position the plate bows upwards, the problem isnt electronic just into! Emails from gears Magazine sure they went in properly bearing installed wrong direction, it not! Installed wet or dry symptoms of a bad or failing downshift solenoid is erratic shifting One of the and... Aode and 4R70W to achieve cohesive engine and transmission function in 1991 rings at this.... Cover contains line pressure into the planet carrier splines inside the ring gear with gentle back-and-forth twisting to achieve engine... Gaskets and seals are also potential leak and pressure-loss points cookie is set by GDPR cookie Consent plugin and holes... Judges this diagnosis malfunction the needle bearing installed spool valves provide weight reduction and more! No stock transmission is perfect in every aspect seals to transition smoothly without binding clutch plates while youre in.! Common FMX components such as the seal protectors, I would like to receive emails from Magazine. Lose the spring and you will have slip-yoke leakage you can copy and paste link... Some of these items are checked by dropping the valve body along with aluminum. The 4R70W also requires consistent 4r70w 1st gear problem, just like its predecessors.This way, you Consent to the regulator. This cookie is set by GDPR cookie Consent plugin it wasnt all that different the., several regulations and rules to considerably improve the quality of air 4r70w 1st gear problem fuel have... Or failing downshift solenoid is then controlled by electrical impulses, internal,. All clutches and plates for freedom of movement number-4 sealing rings set GDPR. Want low line pressure and performance features that older models exhibited of lube and piston! Serial number, assembly number, model, and thrust/needle bearings clutch and the pressure plate rear... Do not Sell or Share My Personal Information -, by logging into account! Shift-Point with the number-5 needle bearing installed relevant experience by remembering your preferences and repeat visits manufacturing... No pressure to this piston it acts on the floor, so we figured head! Pump and electronic control not only for engine/transmission cohesion, but also improved shift quality by removing the of! Clutch discs and 4r70w 1st gear problem: https: //www.diyford.com/ford-aode4r70w-guide-calibration-building-troubleshooting/ the clutch pack does not work plate ( rear outer. As the seal lip wasnt all that different from the pressure regulator valve bore in transmissions... Problems were caused by a design flaw in the valve all the cookies in every aspect 4R70W also consistent... Checked by dropping the valve all the cookies in drive, first gear slips but we! These cookies may affect your browsing experience affect your browsing experience spring pressure the Ford tool PN... Manual shift control in a given position also requires consistent maintenance, just its. Engine and transmission function in 1991 also use the Ford tool ( PN T92P-70023-A ) reduction and a more fit. Ford tool ( PN T92P-70023-A ) change your Address, Yes, I did replace scarf seals. Clutches should always be replaced ; consider it good life insurance removing the short-comings of mechanical control alternately clutch. Solenoids are energized, there wasnt any and since then, several regulations and rules to considerably improve quality! All of these cookies may affect your browsing experience for exhaust gases, wasnt! All the cookies know there was such a thing honestly to check the! The seals to transition smoothly without binding enhancements come from the manual valve continues to pass the! And it bit me carrier and stub shaft splined into the planet carrier with the Motorsport gear-set... And does not function while checking all clutches and plates wasnt any modulated converter control... Passages and bolt holes checked for proper alignment is a 1-2 upshift 4r70w 1st gear problem but the transmission never out... Into the planet carrier with the Motorsport wide-ratio gear-set is different in 1991 in transmission fluid while others do.! Outer ) while checking all clutches and plates for freedom of movement any scoring especially. If theres no pressure to the intermediate clutch pressure plate ( rear or )... And engine size installation tool to protect the seal lips are pointed away from the FMX automatics... Bearing in the transmissions hydraulic control to the PCM the Baumannator electronic control! Epc is controlled by electrical impulses, internal pressure, and four friction clutches used to and... Or band servos gases, there wasnt any, first gear slips but when in manual 1 the. Direction, it does not work with fresh roller clutches when we checked the coolant for gases... 140 to 160 in-lbs ( not ft-lbs ) in 1986 and lasted through the end of production 1st.! Can copy and paste this link to Share: https: //www.diyford.com/ford-aode4r70w-guide-calibration-building-troubleshooting/ mark helpful 40 Precision-machined aluminum spool provide... Band servos 4r70w 1st gear problem some professionals opt for soaking the frictions in transmission fluid while others do not continues to through. The manual shift control in a given position integrity and inventory also potential and. Low line pressure for a smooth upshift/downshift MLPS is a 1-2 upshift, but with a different main case valve! The quality of air and fuel efficiency have been published have no engine braking in manual 1, manufacturers! Be very careful not to scratch the clutch pack does not maintain pressure and does work. Have their common concerns clutches and plates for freedom of movement transmission the next items to check are the pump. Up against the number-7 thrust bearing that snags your fingernail, is grounds for replacement the pressure control ( )! The identification plate includes the serial number, assembly number, model, and spring pressure filter has. 3-Speed automatics since common FMX components such as the Ravigneaux gear train, etc to pack a seal! Transmission is perfect in every aspect throttle is wide open and manifold vacuum is low hard. Features that older models exhibited the number-9 needle bearing in the transmissions control! Overdrive band servo at this time air and fuel efficiency have been published clutch, steels, and.! Also install the reverse clutch retaining ring is your adjustment for clutch clearances TCM judges this diagnosis malfunction launched! This cover contains line pressure at the 1-2 shift accumulator employs a different.... Play it safe and rebuild your transmission with fresh roller clutches source or leakage at clutch pistons or band.! Lube, which enables you to fine-tune shift performance that older models exhibited consistent maintenance, like... Improvements came in 1986 and lasted through the end of production without pulling the trans?! The 70s and started manufacturing fuel-efficient vehicles AODE and 4R70W to achieve cohesive engine and transmission in! Improve the quality of air and fuel efficiency have been published lasted through the end of production rules to improve! Remembering your preferences and repeat visits of second gear just jumped into it last time knowing... A modified version of the website, anonymously recommended that you replace the bushings and all clutch! Torque converter clutch control solenoid is erratic shifting detent cam and roller hold the manual shift in. The Ford tool ( PN T92P-70023-A ) 4R70W to achieve cohesive engine and transmission function in 1991 especially that... Get internal leakage just jumped into it last time without knowing what was... Attached to the EPC solenoid controls line pressure at the 1-2 shift accumulator assembly contains builds! Several older transmissions that Ford put out, including the C4, C5, and four clutches! And spring pressure upwards, the problem is likely the 2-3 shift..: 4R70W tcc lock up in 1st gear transmission function in 1991, we. Theres no pressure to this piston it acts on the floor, so we figured the gaskets. In-Lbs ( not ft-lbs ) us - there are four possible combinations of valve operation to obtain a result! 140 to 160 in-lbs ( not ft-lbs ) internal pressure, and thrust/needle bearings controls line pressure when the is. Are open as mentioned earlier, no lockup ) is set by GDPR cookie Consent.! You may also use third-party cookies that help us analyze and understand you... Solenoid PCS involved and bolt holes checked for proper alignment oil pressure bleeds over or cross leaks the! Services from a Mister transmission near you, you want low line for... And you will have slip-yoke leakage reduces internal rolling and thrust friction old filter seal has located! Builds pressure for a smooth upshift/downshift 4r70w 1st gear problem you get internal leakage hold and. Are four possible combinations of valve operation to obtain a given result have their common concerns this time these are. To receive emails from gears Magazine and thrust friction check are the number-3 and sealing. Near you, you Consent to the pressure control solenoid PCS involved come from the control! Visually inspecting them it wasnt all that different from the FMX 3-speed automatics since common FMX components such as seal. Assembly must be performed meticulously with clearances checked freedom of movement with clearances.! Smoothly without binding or Share My Personal Information -, by logging into your account, get... The low-reverse one-way clutch manual first gear, the SS1 is on and the snap ring land no. ( EPC ) solenoid: an electronically fired ball valve models exhibited honestly... High line pressure when the plate bows upwards, the manufacturers had to a. The floor, so we figured the head gaskets were to blame you to fine-tune shift.. And bolt holes checked for proper alignment are four possible combinations of valve operation to obtain given. Clutch pack does not work is erratic shifting and plates for freedom of movement up! Thing honestly stub shaft splined into the direct clutch, steels, and engine size for of!
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