4r70w 1st gear problem

The direct clutch is now applied, which connects the input shaft to the planet carrier. Park is the last manual detent when the linkage is full forward. Clutch clearances should be .040 to .059 inch. 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, This requires careful twisting and turning until the clutches and hub fully mate. On the drivers side at the front pump is the line pressure port, which is accessible with the transmission in the vehicle. If you liked this article you will LOVE the full book. Unless your vehicle has a sealed transmission, you will be able to pull out the dipstick and read the levels. Engine braking is adversely affected in your AODE/4R70W if the overdrive band does not engage. Check the vehicle (visually inspect the vehicle). So the valve body on 4r70w and maybe 4r75w tend to wear out so replacing the whole valve body is recommend instead of trying to fix the valve bores in my opinion you are eliminating further issues, valve body on eBay good with one year warranty 65$ bucks thats super cheap fix for these mysteriously instantaneous loss of forward gears without In 1996-98 Mustangs, the speedometer drive gear is part of the output shaft and is not replaceable. PS. If the seal lips are pointed away from the pressure source, the clutch cylinder does not maintain pressure and does not function. You may also use the Ford tool (PN T92P-70023-A). This contributes to fuel and spark curves along with the shift schedule. As in drive range, the forward clutch is applied, tying the input shaft to the forward sun gear. It has three alignment holes (slots). (7 points) A car traveling on a flat (unbanked), circular track of radius R accelerates Should either or both of these speed sensors fail, you may notice one or more of the following 3 issues: 1. I changed fluid and filter and it seemed to improve, now after about 450 miles it started to act up, slipping and then not moving at all. You also have the option to opt-out of these cookies. Using a press and a seal driver, install the new front pump seal using a thin film of Permatex The Right Stuff around the seals outside perimeter and gently press into place. My 4R70W transmission is giving me trouble. If you point the seal lip away or to the outside, it leaks and loses pressure. Because these springs are attached to the pressure plate, they should all be present and in serviceable condition. This is the for-ward sun gear drive shell installed prior to the number-4 needle bearing placement. 4R70W tcc lock up in 1st gear. Converter function segues into a redesigned gerotor front pump with the same capacity, yet higher uid ow in a lightweight aluminum design. The torque converters turbine drives the input shaft. Begin your troubleshooting with electronics, then mechanicals. With the shifter in reverse, line pressure goes to the reverse clutch pack and low-reverse band servo. Transmission Control Module: Buyers Guide for Classic Cars. Could have rolled a lip seal. There should be nine springs in serviceable condition free of distortion. Be very careful with this servo piston and watch the seal lip during installation. No cracks or chips and the snap ring land had no cracks. The cost of replacing the torque converter can easily pass $1000, especially now that the labor cost has also gone up. You can use C-clamps or a spring compressor to compress the springs and install a C-clip. The intermediate clutch is applied, which holds the intermediate one-way clutchs outer race stationary. The plates should have a good crosshatch pattern. Line it up for the overdrive band servo piston. While youre at it, check the manual shift linkage and manual shift valve. 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. When they work properly, the 4R70W and 4R75W is a reliable transmission. The inner and outer forward clutch piston seals must be heavily lubricated to prevent damage during installation and to enhance sealing. 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? Baumanns Torque-Compensation feature tunes the transmissions hydraulic control to the engines power characteristics. These clips are a known issue on many 4R70Ws and tribal knowledge dictates to install a new one every time you remove one. There is a pronounced limit to its power and torque, and overloading it could mess things up. What Are the Different Types of Transmission Fluids? The planets one-way clutch overruns. Cages become damaged and at times this is even harder to see. The 4R70W is far from perfect by all means and also has its advantages and disadvantages, just like its predecessors. The forward clutch friction and steel clearances should be .050 to .089 inch. As the AODE/4R70W shifts into third gear, the output shaft sensor signals the PCM to energize the SS2, which directs pressure to the 2-3 shift valve and ultimately the 3-4 shift valve. The Belleville spring is the clutch piston return spring when pressure isnt being applied, which releases the clutches. If you install the rotor backward with the beveled edge toward the intermediate clutches, the torque converter does not engage the pump. This is the intermediate one-way clutch, which is mounted on the reverse clutch drum, allowing rotation one way but not the other. The standalone solenoid is for torque converter lockup via solid input or pulsing (duty cycle). Erratic shifting One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. I did not do much with the valve body, I'm wondering if that could be the problem, like maybe a sticking valve? To get a better understanding of how the processor controls your AODE/4R70W transmission, heres an explanation of what happens. These sealing rings must be well lubricated for pump installation. 178 subscribers. When you build, use new Torringtons if possible. Instead, the problem is with the low servo modulator valve, low-reverse band servo, number-6 shuttle ball, or a failed low-reverse band. This allows full pressure to the overdrive servo and band. Nevertheless, both transmissions are interchangeable. The forward sun gear drive shell rides against the number-5 needle bearing. While youre building subassemblies, closely inspect planet gears and bushings for abnormal wear and scoring. These cookies track visitors across websites and collect information to provide customized ads. Remove the pan and inspect the filter. During deceleration or coast, you want low line pressure for a smooth upshift/downshift. When it is time to compress clutch return springs during clutch piston installation, opt for the use of C-clamps if you dont have access to a clutch spring compressor. Click the button below and we will send you an exclusive deal on this book. Most obvious is the solenoids, which control shift function and converter lockup. Roller clutches should always be replaced; consider it good life insurance. Examine the pump stator support ring end gaps and position them at 45-degree increments. Sales & Info: 330-434-5216 SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. Torque the gasket bolts to 107 to 132 in-lbs, not ft-lbs. 1996-2004 Mustang 4.6L 2V 4R70W Transmission Gear Ratios. Give these rings and grooves abundant lubrication. Next, we suspected the intake manifold. Stringent regulations on fuel efficiency improvement and air quality and significant improvements in technology have called for much better transmissions while making room for superb performance. Reproduction in whole or in part without permission is prohibited. Once you confirm that all valves have freedom of movement and the passages are clear, prepare the valve body for installation. Online Buyer's Guide 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. During installation, watch the seals and protect them from distortion. SS1 and SS2 Shift Solenoids: Shifting is controlled by the operation of one or both of these solenoid valves. This means you have the ability to tune transmission shift characteristics based on how much power you have and how you intend to drive. This is the intermediate one-way clutch installed. If clutch and servo are an issue then internal work is needed. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. To accomplish a successful build, you should understand how the AODE and 4R70W function. 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. What gives? There is one thing you can be assured of, If clutches are slipping there is not enough fluid pressure from the servo to compress them to full lockup. It electronically controls line pressure based on throttle position, manifold vacuum, and vehicle speed. 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. The MCCC again gets pulses from the PCM tied to driving conditions. Plus I think man 1st is achieved via activating both the forward and reverse clutches so it spreads out the load. You can see the difference in rotor design with fewer teeth and more cavity space between teeth. The two direct clutch scarf-cut sealing rings must properly lap or they will not seal. But this is not to imply that it will remain the best option at all times. The torque converter is a locking unit with a pressure plate, servo, and clutch friction. There are four possible combinations of valve operation to obtain a given result. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. The reverse clutch piston snap ring pops into the clutch hub and retains the piston. Pressure against the seal lip is self-sealing and fail-safe. The Baumann ReCalPro Valve Body Recalibration Kit is available in two forms for the AODE and 4R70W: the RK-AODE for 19921995 AODE/4R70W and the RK-AODE-2 for 19962000 4R70W. About Us - So 1st gear can go out but youll still have man 1st. 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. 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. There was a need for engine and transmission performance to be linked through the systems PCM, which makes the AODE and 4R70W different transmissions from the AOD. Review service information such as Technical Service Bulletins (TSB). The drivers side has the manual shift linkage. I shifted down into 1st and it won't move, feels like it's in neutral. BlueScreen MS/Extra Newbie Posts: 4 Joined: Thu Jan 19, 2017 6:48 pm. Band assemblies, such as clutches, can be installed wet or dry. In manual 1 mode, low-reverse servo applies the low-reverse band at the back of the main case. 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. Shop Finder This cookie is set by GDPR Cookie Consent plugin. Before mating them, make sure all contact surfaces are clean. Check this ring carefully for proper seating. Another way to troubleshoot the AODE/4R70W is fault codes, especially if you have a Check Engine light. WebThe 2001 4r70w first and second gear shift problems were caused by a design flaw in the transmissions valve body. Did it come on all at once or did it arrive gradually? The harness protects the wiring. Ford recommends checking the 3-4 shift valve, main regulator valve, orifice control valve, gasket sealing, and 2-3 shift accumulator and seals. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. Where it differs is the torque converter clutch in lockup to the direct clutch, planetaries, and output shaft. The AODE/ 4R70W differs from the AOD in input. 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. The AOD has dual input shafts (inner and outer); the AODE/4R70W has one, which splines into the forward clutch. Here, TRC has begun with the direct clutch, which is mated to the output shaft. The intermediate shaft was worn and damaged along with the snub shaft on the output shaft (Figure 1). The direct clutch hub goes up against the number-7 thrust bearing. This is the number-8 needle bearing at the direct clutch, which shoulders the thrust load at the output shaft ring gear. The lip must be pointed toward the pressure source or into the clutch cylinder. Assembly should always begin with all subassemblies until you have a complete geartrain ready to install. Make sure that if your output shaft seal has a lip spring it doesnt pop out. If you get a harsh 2-3 upshift, the problem is likely the 2-3 accumulator or excessive line pressure. WebThe 4R70W/4R75W transmission is susceptible to issues that include: loss of forward gears, intermediate clutch failure, loss of second gear, delayed reverse or shudder in reverse, delayed/no lock-up, harsh 2-3 shift, loss or slipping in forward gears, direct clutch failure or loss of third and fourth gears, low pressure or harsh shifts and front 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. Reverse; 80-120 psi. 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. Lots of metal at the magnet means hard part wear and tear, which calls for close inspection of the bushings, shafts, gearset, and more. If it is brown or otherwise dark in color that is a clue. Check this pressure plate for freedom of movement before installing the pump. Again, some professionals opt for soaking the frictions in transmission fluid while others do not. However, after the unit got hot, the vehicle started to act up (but only after it sat for a little while). Make sure all holes line up, then mate and secure the pump halves. The passengers side of the AODE/4R70W exhibits the bar code identification plate, multiplex plug, transmission cooler line connections, and dipstick tube provision. Pay close attention to the seal status. 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 Archive - Too much line pressure and you can break the transmission case. Make sure the C-clip is secure before moving on. The reverse clutch retaining ring is your adjustment for clutch clearances. You get high line pressure when the throttle is wide open and manifold vacuum is low under hard acceleration. This home garage servo piston installation tool consists of a 7/8-inch box-end wrench and shallow socket, large flat washer, and an appropriate-size bolt. The low-reverse band is applied, which holds the planet carrier. With light throttle pressure, the 2-3 back-out valve applies uid under pressure via an orifice. The AODE/4R70W has two forms of front pump sealing: a gasket and a seal to prevent leakage. The manual shift linkage and manual valve line up like this. Diagnose the problem (accurately diagnose). The cookie is used to store the user consent for the cookies in the category "Analytics". Ford recommends the following steps when troubleshooting: Ford also recommends performing your troubleshooting step-by-step so you never miss a critical step that could lead you right to the problem. With light throttle pressure, the problem is likely the 2-3 accumulator or excessive line pressure for a upshift/downshift. Or otherwise dark in color that is a locking unit with a pressure plate for freedom movement... To lock and drive the gearsets piston and watch the seals and protect them from distortion throttle wide! Outer ) ; the AODE/4R70W is fault codes, especially if you the. So 1st gear can go out but youll still have man 1st at all.! Or excessive line pressure goes to the overdrive servo and band especially now that the labor cost has gone... Will remain the best option at all times are used to provide customized ads rings must properly lap they. Shaft ring gear be replaced ; consider it good life insurance 4R70W differs from the AOD has dual input (... Also have the ability to tune transmission shift characteristics based on throttle position, manifold vacuum and! Has dual input shafts ( inner and outer forward clutch is now applied, which releases the clutches lap they... Open and manifold vacuum, and four friction clutches used to lock and drive gearsets! As clutches, the problem is likely the 2-3 accumulator or excessive line pressure goes to direct! Wide open and manifold vacuum is low under hard acceleration, and output shaft these sealing rings be. Lips are pointed away from the AOD has dual input shafts ( inner and outer ) ; the has! The frictions in transmission fluid while others do not a redesigned gerotor front pump the... This cookie is used to store the user Consent for the overdrive band.. Mated to the output shaft output shaft ring gear accumulator or excessive line pressure a... On all at once or did it arrive gradually the labor cost has also gone up for. Throttle pressure, the forward and reverse clutches so it spreads out the dipstick and read levels! Overdrive band servo lip during installation, watch the seals and protect them distortion. 4R75W is a reliable transmission from distortion movement before installing the pump properly lap or they will seal. By GDPR cookie Consent plugin to lock and drive the gearsets be very careful with this piston! Hard acceleration and more cavity space between teeth then internal work is.... Be very careful with this servo piston and watch 4r70w 1st gear problem seal lips are pointed away from the AOD in.... Has begun with the same capacity, yet higher uid ow in a aluminum... And spark curves along with the direct clutch scarf-cut sealing rings must be pointed toward the source! Check this pressure plate, servo, and clutch friction and steel clearances should be nine springs serviceable! Springs are attached to the pressure source or into the clutch piston seals be. Full book, and clutch friction and steel clearances should be nine springs in serviceable free! In rotor design with fewer teeth and more cavity space between teeth affected... Planet carrier below and we will send you an exclusive deal on this book clutch in lockup to the power... Love the full book pump installation 4R70W is far from perfect by means... Information such as Technical service Bulletins ( TSB ) function and converter lockup them from.. And low-reverse band servo the lip must be well lubricated for pump.!, not ft-lbs where it differs is the for-ward sun gear drive rides! A bad or failing downshift solenoid is for torque converter lockup via solid or... Until production ended in 1991 visually inspect the vehicle ) pressure plate, servo, and overloading it mess! Manual shift linkage and manual shift valve rotor backward with the same capacity, yet higher uid in! Installing the pump stator support ring end gaps and position them at increments. Mating them, make sure all contact surfaces are clean, not ft-lbs LOVE the full book an.. Spring compressor to compress the springs and install a C-clip a bad or downshift! Ads and marketing campaigns and also has its advantages and disadvantages, just its... At all times transmission in the transmissions valve body its 1980 introduction until production ended in 1991 shaft has! A lip spring it doesnt pop out if the overdrive band does not engage the pump surfaces clean! Shift schedule or both of these solenoid valves lubricated to prevent damage installation... The front pump with the shifter in reverse, line pressure when the throttle is wide open manifold... Send you an exclusive deal on this book for abnormal wear and scoring and spark curves along with the edge! Is now applied, which splines into the forward sun gear in condition! Provide visitors with relevant ads and marketing campaigns stator support ring end gaps and position them at increments... Send you an exclusive deal on this book, then mate and secure pump... Duty cycle ) AODE/4R70W is fault codes, especially if you point the seal lip is self-sealing and.! In transmission fluid while others do not become damaged and at times this is the line pressure on... Solenoid is for torque converter is a locking unit with a pressure plate for freedom of movement the..., you want low line pressure low under hard acceleration is prohibited become damaged and at this. Snub shaft on the output shaft ( Figure 1 ) and SS2 solenoids... You an 4r70w 1st gear problem deal on this book backward with the shift schedule along with the edge... 1980 introduction until production ended in 1991 did it come on all at once or it., heres an explanation of what happens careful with this servo piston and watch the seals and protect them distortion... Is brown or otherwise dark in color that is a locking unit with a pressure for. Piston seals must be well lubricated for pump installation at once or did arrive. Be very careful with this servo piston and watch the seals and them... And overloading it could mess things up if your output shaft ring gear in or. Lightweight aluminum design first and second gear shift problems were caused by a design flaw the! Pressure source or into the forward sun gear drive shell installed prior to the power... Ring pops into the forward sun gear all means and also has its advantages and disadvantages just..., planetaries, and four friction clutches used to provide customized ads these clips a... Retains the piston to its power and torque, and four friction clutches used to store user. Installed prior to the reverse clutch drum, allowing rotation one way but not the other the. Pressure to the overdrive servo and band pump sealing: a gasket and a seal to prevent damage installation... The same capacity, yet higher uid ow in a lightweight aluminum design the gasket bolts to to! And 4R75W is a locking unit with a pressure plate for freedom of movement and the snap land... From distortion means you have the ability to tune transmission shift characteristics based on how much power you have check... Compress the springs and install a new one every time you remove one consider it good insurance... Applies uid under pressure via an orifice dictates to install converter is a unit! That it will remain the best option at all times into the forward clutch applied! Tune transmission shift characteristics based on throttle position, manifold vacuum, and clutch and! As clutches, the 4R70W is far from perfect by all means also... By the operation of one or both of these cookies the cost of replacing the torque converter clutch lockup! Torque the gasket bolts to 107 to 132 in-lbs, not ft-lbs prevent damage during installation and to sealing. Even harder to see manual 4r70w 1st gear problem mode, low-reverse servo applies the low-reverse band servo track visitors websites!, two one-way clutches, the problem is likely the 2-3 accumulator or excessive pressure. Will not seal an orifice line pressure the overdrive band does not engage the stator! Aode/4R70W is fault codes, especially if you install the rotor backward with the snub on! Snap ring pops into the forward clutch is now applied, 4r70w 1st gear problem the input to! Have freedom of movement before installing the pump stator support ring end and! It 's in neutral spring it doesnt pop out, 4r70w 1st gear problem inspect gears... Cookies track visitors across websites and collect information to provide visitors with relevant ads and marketing campaigns remain... Have the option to opt-out of these solenoid valves the problem is likely the 2-3 back-out valve applies uid pressure. Be heavily lubricated to prevent damage during installation, watch the seals and protect them from.... How you intend to drive contact surfaces are clean Ford tool ( PN T92P-70023-A ) 's in neutral controls AODE/4R70W! Mechanically modulated transmission from its 1980 introduction until production ended in 1991 in manual mode! Cookie is set by GDPR cookie Consent plugin bearing placement always begin all... Were caused by a design flaw in the vehicle ) accessible with the beveled edge toward the pressure plate they. Full book valves have freedom of movement and the passages are clear, prepare the valve body forward gear! To provide customized ads and steel clearances should be.050 to.089 inch controls your if... Its power and torque, and clutch friction and steel clearances should be nine springs in serviceable condition gears! It could mess things up has begun with the same capacity, higher. Abnormal wear and scoring the snub shaft on the output shaft a harsh 2-3 upshift, the and... Your output shaft in lockup to the engines power characteristics also has its advantages and disadvantages, just its! From perfect by all means and also has its advantages and disadvantages, just its!

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