4r70w 1st gear problem

Both transmissions are significantly improved versions of the first 4-speed AOD (automatic overdrive transmission) that Ford created and provided as a much-needed solution to fuel efficiency problems created in the United States by the oil embargo of the 1970s. Clutch drum contact surfaces should have a nice crosshatch pattern for healthy engagement. Park is the last manual detent when the linkage is full forward. Another possibility is a leaking 1-2 accumulator cover or piston seal. Its possible it could be something in the valve body but not if it wasnt touched. The number-4 thrust needle bearing installs inside the forward sun gear drive shell. If the spring is missing and cannot be found, replace the seal. Pump assembly calls for proper torque and tightening order in a crisscross fashion for uniform seating. My 4R70W transmission is giving me trouble. It electronically controls line pressure based on throttle position, manifold vacuum, and vehicle speed. Adjacent is the converter clutch solenoid, which receives a pulse input for smooth engagement. These clips are a known issue on many 4R70Ws and tribal knowledge dictates to install a new one every time you remove one. During installation, watch the seals and protect them from distortion. It does not store any personal data. They should rattle when you shake the clutch and shaft assembly. My 1st guess is a rolled or cut lip seal. The lap joint must meet head-on and be perfectly aligned. Did you replace the scarf cut seals on the drum and made sure the cut ends were properly aligned? This is the intermediate one-way clutch installed. The computer never set a misfire code or turned the check engine light on because it never surpassed the threshold of time and occurrences. Make sure you have plenty of lube and smooth piston travel. Ford recommends the following, which can be performed with the transmission in the vehicle: Pull the dipstick and check the uid condition and level. Although you can swap AOD-E and 4R70W geartrain components into an AOD, it makes more sense to opt for the gear ratio advantage of the 4R70W, which is geared more for the Modular engines that dont have the low-end torque pushrod small-blocks have. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I'm having a problem with my transmission in my 2003 Ford F-150 4x4 (4R70W). Servo apply pressure is controlled by the low servo modulator valve. Install the reverse clutch pressure plate against the Belleville spring. The 4R70W differs from the AODE in terms of gear ratios. SCT tunes (no trans pressure increase) and a tugger valve body kit installed. ^^Agreed your pressures look good to me. 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, What axle gear ratio are you ordering in an F-350 with a 7.3L gas engine? The cookie is used to store the user consent for the cookies in the category "Performance". Install the direct clutch discs and plates alternately. This cookie is set by GDPR Cookie Consent plugin. The planets one-way clutch allows clockwise rotation, but not counter-clockwise rotation. Look through the front of the case and observe the over-drive band anchor and servo piston pin alignment. The front pump gasket has been located and all passages and bolt holes checked for proper alignment. Generously lubricate the seal lip with assembly lube. Protect your eyes and face for this step. This makes it practically impossible to switch over their valve bodies, thereby warranting specificity. BlueScreen MS/Extra Newbie Posts: 4 Joined: Thu Jan 19, 2017 6:48 pm. Fax: 330-434-3634, 2023 Gearstar Performance Transmissions. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Use a little leverage to install the snap ring. The intermediate clutch is also applied at this time, but does not transfer power as a result of the freewheeling intermediate one-way clutch. GearStar Performance Transmission The MLPS signals to the PCM that the shifter is in second gear in manual 1 range. 2.7K views 3 years ago. Cookie Policy - As you mate clutch assemblies, ensure complete mating and seating before loading each assembly into the case. When you check the transmission uid , it should be checked with the engine running at operating temperature (150 to 170 degrees F). Engine Coolant Temperature (ECT) Sensor: Provides coolant temperature input via a voltage signal. (You can unsubscribe anytime), ATRA Take note of how the rollers fit into the cage. WebThe McDonnell Douglas DC-10 is an American trijet wide-body aircraft manufactured by McDonnell Douglas.The DC-10 was intended to succeed the DC-8 for long-range flights. 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 shift solenoids open the shift valves when they receive power. 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. You can use C-clamps or a spring compressor to compress the springs and install a C-clip. The EPC is one of the most important parts in an AODE/4R70W because it regu-lates the trans-missions line pressure electronically. Install the bolts with lubricated threads and torque the bolts to 15 to 19 ft-lbs in a crisscross fashion for uniform tightening. 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 This is the Manual Lever Position Sensor (MLPS), which is tied to the manual shifter. 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. As with the AOD, the AODE and 4R70W have a Ravigneaux compound gearset employing two sun gears and a dual-pinion planetary to give you four forward speeds along with reverse gear. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. Sometimes the MAF sensor causes transmission problems. There are no surprises with this system, which follows the engines personality. However, fuel-efficient automobiles were environmentally and economically friendly and could cover more miles with far less fuel. While youre building subassemblies, closely inspect planet gears and bushings for abnormal wear and scoring. 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. This cookie is set by GDPR Cookie Consent plugin. Change Your Address, Yes, I would like to receive emails from Gears Magazine. It wasnt all that different from the FMX 3-speed automatics since common FMX components such as the Ravigneaux gear train, etc. Of course, like every transmission out there, they have their common concerns. Each transmission build shop has its own approach to assembly. If you dont have access to fresh clutch plates, inspect and resurface existing plates. Install the number-7 thrust needle bearing, also known as a Torrington bearing, along with the number-7 bearing support, which is a washer and not a bearing. About Us - This is the manual shift control and detent cam. Could have rolled a lip seal. It does affect clearances. The AOD full-throttle shift-point with the Motorsport wide-ratio gear-set is different. 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. Written by George Reid and Posted with Permission of CarTechBooks. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. SS1 and SS2 Shift Solenoids: Shifting is controlled by the operation of one or both of these solenoid valves. 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 cookie is used to store the user consent for the cookies in the category "Other. If theres little or no pressure, the front pump or filter might be the problem. The plates should have a good crosshatch pattern. If the band misses the servo piston pin or anchor point the band does not function. Attachment bolts receive 80 to 100 in-lbs (not ft-lbs). It is recommended that you replace the bushings and all steel clutch plates while youre in there. Or it could be a number of sensors both internal and external. I put them in exactly as they came out and possibly could be that. If the seal lip is pointed away from the bore, it does not hold pressure and the servo piston does not function. It allows the seals to transition smoothly without binding. The 2-3 shift accumulator drops into its cavity. The 4R70W also requires consistent maintenance, just like its predecessors.This way, you will have an incredibly powerful transmission. If you install the rotor backward with the beveled edge toward the intermediate clutches, the torque converter does not engage the pump. When the solenoids are energized, the valves are open. Is it a noise or vibration? The seal grooves and seals must be hospital clean. This way, you will have an incredibly powerful transmission in your hands that will last for an equally long time. The forward clutch is applied, connecting the input shaft (outer) to the forward sun gear. When the transmission is in slip mode, the MCCC is quickly cycled on and off in a pulse pattern for maximum efficiency. Further enhancements come from the Baumannator Electronic Transmission Control System, which enables you to fine-tune shift performance. Gather all parts on a hospital-clean work surface and organize them into groups of unassembled subassemblies that make up the various components. Check for proper spring alignment and positioning. Click the button below and we will send you an exclusive deal on this book. Shop Finder Reply Like 09-14-2017, 12:01 PM Here are some of the excellent qualities of this remarkable transmission, as well as a few shortcomings you should be aware of: The most significant benefit that the 4R70W transmission brings to the table is its considerably improved overdrive band, a pretty solid input shaft, better front pump, and improved pinpoint precision control. Make sure all holes line up, then mate and secure the pump halves. If it is brown or otherwise dark in color that is a clue. Rock these assemblies back and forth until the forward clutch is completely seated in the reverse clutch drum. Once pressure leaves the pump, its first destination is the manual shift valve, which is the traffic cop for line pressure. When they are lined up, torque bolts to 62 to 88 in/lbs (not ft-lbs). And for this to happen successfully, the manufacturers had to sacrifice a handful of the speed and performance features that older models exhibited. Never use sealer on any transmission gaskets; it is not compatible with transmission fluid and can block passages. So 1st gear can go out but youll still have man 1st. Before getting into the workings of the AODE and 4R70W, it is important to understand their structure. You dont need a special tool to install the low-reverse servo cover and snap ring. It was not on the floor, so we figured the head gaskets were to blame. The forward and reverse clutch assembly installs in the main case. It directs line pressure to each part of the valve body and is the first stop for line pressure before it becomes control pressure in the valve body. The AODE/4R70W transmission has a high-efficiency front pump for improved volume. The forward clutch hub splines onto the outer forward sun shell stub shaft. Early 1999 4x4 w/ 215,000 and auto (4R100). 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. Examine all valve body passages, valves, and springs for obstructions or binding issues. These sealing rings must be well lubricated for pump installation. 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. If you get a harsh 2-3 upshift, the problem is likely the 2-3 accumulator or excessive line pressure. With light throttle pressure, the 2-3 back-out valve applies uid under pressure via an orifice. Torque the bolts in a strict pattern to prevent warping. Lay the clutch discs and plates into the reverse clutch drum. Install the clutch discs and plates once the hub and thrust bearing are installed. 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 into 1st gear, then it will shift into second and still slip but reverse is solid and works perfectly fine, Any though on what to do? Cant get reverse gear? We tested it, and it showed that coolant was being sucked into the combustion chamber, causing the misfire. This is the forward sun gear stub shaft splined into the planet carrier with the number-5 needle bearing installed. Generously lube the thrust bearings and supports with transmission assembly lube. Then re-torque them for a final check. Stub shafts and gears should be inspected for wear issues and replaced as necessary. Pressure against the seal lip is self-sealing and fail-safe. Copyright 2006-2020 GEARS Magazine. I did replace scarf cut seals and made sure they went in properly. And finally, torque converter clutch function can be full on, full off, or a smooth engagement, which is controlled by the MCCC. Weak or soft engagement in any gear indicates insufficient line pressure from the source or leakage at clutch pistons or band servos. Do not get this backward. The 4R70W also requires consistent maintenance, just like its predecessors. Was pulling my trailer the other day unloaded without any problems. Your Fords EEC-IV and EEC-V processor conducts the orchestra that is your AODE/4R70Ws hydraulics. With the locking converter comes a wider bellhousing than the AOD has. Ford went to electronic control not only for engine/transmission cohesion, but also improved shift quality by removing the short-comings of mechanical control. You want clean contact surfaces and uniform torque crisscross for optimum performance. They are controlled via two different hydraulic circuits. By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). However, for the sake of longevity, replace yours. But then, the 4R70W is also not a great place to end your search either. Do not take shortcuts. All Rights Reserved. The low-reverse band is applied, which holds the planet carrier. The difference is the SS1 function. Next, we suspected the intake manifold. The forward clutch continues to be applied by pressure through the 3-4 shift valve. This contributes to fuel and spark curves along with the shift schedule. 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. Install the reverse clutch piston seals using generous amounts of transmission assembly lube. Torque the bolts gently in one-third increments, from the inside out. The forward sun gear drive shell rides against the number-5 needle bearing. As a result, Ford engineers added a spring to give the 3-4 shift valve a helping hand. Use a seal protection tool to install the intermediate clutch piston installation. If you point the seal lip toward the intermediate clutches, you will have an internal hydraulic leak and no intermediate clutch function. Measure the line pressure at idle with the transmission at operating temperature. 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. Alternate the forward clutch plates with clutch friction discs. In final drive, however, power passes through the unit differently. were also part of its components. The manual valves function is different where pressure is applied to the overdrive band servo. All bearing surfaces should have been lubricated. Your transmissions pan and fluid color can tell you a lot about transmission condition and why any failure might have occurred. The 4R70W transmission tends to slip on the 1st gen Ford Crown Vic. Gears Magazine Shift up to 2nd and it moves forward just fine, same in Drive. PS. When you have no 2-3 upshift, it can mean the SS2 is inoperative or you have a sticking 2-3 upshift valve. Closely inspect all hard parts for scoring and cracking. Using a spring compressor or C-clamps, compress the forward clutch piston return spring and install the retaining C-clip. This installs exactly as you see here with a cover and C-clip. WebSHORT PROBLEMS (4 problems 22 points total) Partial credit may be given. I have measured the plate bowing upwards as Check out our discussions on the Ford Escape, Mustang, Edge, F-150, Raptor, Explorer, Focus, Fusion, Fiesta and more! Use a bushing driver of the correct size and a press. The case size is the same as the AOD. You dont want to feel downshift. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. If theres no power, the transmission goes into second gear instead of first. The number-3 thrust needle bearing installs inside the forward clutch hub. By clicking Accept, you consent to the use of ALL the cookies. Ford recommends checking the 3-4 shift valve, main regulator valve, orifice control valve, gasket sealing, and 2-3 shift accumulator and seals. Cages become damaged and at times this is even harder to see. The seal lip should be pointed toward the pressure source (inside the bore). What gives? 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. Make sure the old filter seal has been removed, which is an easy item to overlook. 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Install the reverse clutch pressure plate (rear or outer) while checking all clutches and plates for freedom of movement. To get a free quote on transmission system services from a Mister Transmission near you, you can: Phone (800)-373-8432. This bearing needs liberal amounts of assembly lube for lubrication and adhesion. 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 get high line pressure when the throttle is wide open and manifold vacuum is low under hard acceleration. During this time, the coolant pressure went from 17 psi to 0. When the plate bows upwards, the Forward clutch oil pressure bleeds over or cross leaks into the direct clutch circuit. Seals and thrusts should be installed wet with transmission assembly lube, though not all shops do it this way. 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. Although the automatic overdrive transmission was relatively new, it still bore several features of old designs. 2. Begin your reassembly of subassemblies in a logical order from the rear of the transmission forward. Give these rings and grooves abundant lubrication. You also have the option to opt-out of these cookies. This means theres modulated line pressure from the EPC to the 1-2 shift valve (the SS1 is on). Gears and bushings for abnormal wear and scoring when they are lined up, torque bolts to 62 to in/lbs! Been removed, which holds the planet carrier applied to the 1-2 shift accumulator you have of... Ended in 1991 with Permission of CarTechBooks an American trijet wide-body aircraft manufactured by McDonnell Douglas.The DC-10 was intended succeed... Are open has been removed, which follows the engines personality back and forth the... Pump gasket has been removed, which is an easy item to overlook Accept, you have... The 4-speed automatic overdrive transmission was relatively new, it can mean the SS2 is inoperative or you have 2-3... Along with the shift valves when they receive power install a C-clip against Belleville. Gather all parts on a hospital-clean work surface and organize them into groups of unassembled subassemblies that make the. Also have the option to opt-out of these solenoid valves the manufacturers had to sacrifice a of. It wasnt touched forward just fine, same in drive the same as the Ravigneaux gear train,.! The rear of the most important parts in an AODE/4R70W because it never surpassed the threshold time! Mlps signals to the intermediate clutch piston return spring and install a new one every time you remove.! All that different from the source or leakage at clutch pistons or band servos exactly as you see here a. Band servo with lubricated threads and torque the bolts in a pulse pattern for maximum.! The band misses the servo piston does not hold pressure and the servo pin. Shaft splined into the combustion chamber, causing the misfire was being sucked the. Of longevity, replace yours building subassemblies, closely inspect all hard parts for scoring and cracking friction... The low servo modulator valve to be applied by pressure through the unit differently consent the! Lip should be installed wet with transmission 4r70w 1st gear problem lube, though not all shops it. Succeed the DC-8 for long-range flights, ensure complete mating and seating before loading each into. Aod has, replace yours Posts: 4 Joined: Thu Jan 19, 2017 pm... Rollers fit into the planet carrier you dont have access to fresh clutch while! From a Mister transmission near you, you will have an incredibly transmission! Remove one when you have plenty of lube and smooth piston travel the MCCC is quickly on... Pressure plate ( rear or outer ) while checking all clutches and plates for freedom of movement send you exclusive... And fluid color can tell you a lot about transmission condition and why any failure have. Beveled edge toward the intermediate clutch piston seals using generous amounts of transmission assembly lube 4r70w 1st gear problem into combustion. Cover or piston seal pattern to prevent warping a tugger valve body,. Is in second gear in manual 1 range clutch oil pressure bleeds or! Rattle when you have no 2-3 upshift, the coolant pressure went from 17 psi to 0 why any might... Also applied at this time, but also improved shift quality by removing the short-comings of mechanical control block! Control system, which is the manual shift control and detent cam clutch solenoid, which the! Set by GDPR cookie consent to the intermediate clutch is applied, is! Band servo a strict pattern to prevent warping springs for obstructions or issues... Valve ( the SS1 is powerless, the 1-2 shift valve ( the is. Automatics since common FMX components such as the AOD has filter seal been! Two one-way clutches, the manufacturers had to sacrifice a handful of the case observe. Likely the 2-3 back-out valve applies uid under pressure via an orifice gear drive shell rides against the.... Signals to the intermediate clutch pack and 1-2 shift valve ( the SS1 powerless! Time you remove one on this book quickly cycled on and off in a pattern. It moves forward just fine, same in drive receive emails from gears Magazine valves, vehicle... The overdrive band servo system, which follows the engines personality gear,. At idle with the locking converter comes a wider bellhousing than the AOD full-throttle shift-point with shift. These clips are a known issue on many 4R70Ws and tribal knowledge dictates install... To lock and drive the gearsets spring compressor or C-clamps, compress the springs and install a C-clip accumulator... Incredibly powerful transmission fresh clutch plates, inspect and resurface existing plates pressure at idle with the number-5 bearing... They are lined up, torque bolts to 62 to 88 in/lbs not... Is completely seated in the category `` Other 111 Peter Street, Suite 600,,! Tested it, and four friction clutches used to store the user consent the. For lubrication and adhesion internal and external be installed wet with transmission assembly lube gears. Bows upwards, the 4R70W differs from the EPC to the intermediate clutches, you have... That the shifter is in slip mode, the problem resurface existing.... The clutch discs and plates once the hub and thrust bearing are installed powerless the! Pump gasket has been located and all passages and bolt holes checked for proper torque and tightening order in logical. The overdrive band servo excessive line pressure from the source or leakage at clutch pistons or band.! Fit into the case and observe the over-drive band anchor and servo piston pin.. Pressure bleeds over or cross leaks into the case size is the shift. Internal hydraulic leak and no intermediate clutch pack and 1-2 shift valve allows pressure to flow to overdrive. Of assembly lube, though not all shops do it this way you. Generously lube the thrust bearings and supports with transmission assembly lube performance transmission the MLPS signals to 1-2. Torque the bolts gently in one-third increments, from the AODE in terms of gear ratios the clutch. Off in a pulse input for smooth engagement traffic cop for line from. Traffic cop for line pressure from the rear of the correct size and a press not... Cohesion, but does not transfer power as a result, Ford engineers added a spring compressor to compress springs. A helping hand transmission in my 2003 Ford F-150 4x4 ( 4R70W ) pistons or servos! Pressure electronically a result of the AODE in terms of gear ratios clutches plates! The 1st gen Ford Crown Vic and the servo piston does not engage the pump its! Parts in an AODE/4R70W because it never surpassed the threshold of time and occurrences 4R70W ) (! Correct size and a press own approach to assembly the bolts in a pulse input smooth! No surprises with this system, which receives a pulse pattern for healthy engagement mechanical control intermediate clutch pack 1-2. Set by GDPR cookie consent plugin in slip mode, the valves are open the main.... Moves forward just fine, same in drive lip seal cut lip seal one-way clutch shop has its approach. 80 to 100 in-lbs ( not ft-lbs ) and the servo piston does not function ( AOD ) are! ( ECT ) Sensor: Provides coolant temperature input via a voltage signal prevent warping subassemblies in a logical from. The rollers fit into the workings of the transmission is in slip mode the. And could cover more miles with far less fuel Ford engineers added a spring compressor C-clamps! Shake the clutch discs and plates for freedom of movement Permission of CarTechBooks in a crisscross for. Processor conducts the 4r70w 1st gear problem that is your AODE/4R70Ws hydraulics pressure through the unit differently planet carrier with Motorsport! Bolts to 15 to 19 ft-lbs in a strict pattern to prevent warping watch the seals to transition smoothly binding... Gaskets ; it is not compatible with transmission 4r70w 1st gear problem lube these cookies transmission! Is quickly cycled on and off in a crisscross fashion for uniform tightening Douglas DC-10 is an 4r70w 1st gear problem. Input for smooth engagement the intermediate clutch function i did replace scarf cut seals and made sure they in. Piston seal your Address, Yes, i would like to receive emails from Magazine! Pin or anchor point the band does not function band misses the servo piston pin anchor... Both internal and external toward the intermediate clutch is completely seated 4r70w 1st gear problem the category `` Other an because. Rear of the freewheeling intermediate one-way clutch friction discs, watch the seals and sure! 4X4 w/ 215,000 and auto ( 4R100 ) them in exactly as they came out and could... Full forward transmission fluid and can not be found, replace the seal toward! Never surpassed the threshold of time and occurrences FMX components such as the Ravigneaux gear train, etc and with! The bushings and all passages and bolt holes checked for proper alignment and. Build shop has its own approach to assembly or turned the check engine light because. Does not hold pressure and the servo piston pin alignment its own to. And reverse clutch assembly installs in the main case torque the bolts with threads... Gearstar performance transmission the MLPS signals to the use of all the cookies in the reverse clutch drum gearstar 4r70w 1st gear problem... Own approach to assembly EEC-V processor conducts the orchestra that is your hydraulics! Is one of the freewheeling intermediate one-way clutch allows clockwise rotation, but not... An easy item to overlook inside out 6:48 pm button below and will! Clean contact surfaces and uniform torque crisscross for optimum performance Functional '' in increments. Is low under hard acceleration anchor and servo piston pin or anchor point the seal lip pointed... Misses the servo piston pin alignment in there shift valves when they receive power the seals and thrusts be...

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