The manual shift linkage and manual valve line up like this. Harsh engagement in any of the forward ranges creates too much line pressure. Examine the check ball for integrity and function, which can be accomplished by shaking the clutch piston and listening for the rattle. The forward clutch piston installs using a Lip Wizard. Ford suggests other possibilities as well: an intermediate clutch piston seal leak or badly worn intermediate clutches. So 1st gear can go out but youll still have man 1st. 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. Keep in mind, Reverse does not use a solenoid 'like' the forward gears. They are bad for breaking at the snap ring land. Park gives the same result but also engages the parking pawl. If your 5,680 rpm 1-2 shift-point is a little too much, you may lower it by using a different governor (the E2AZ-7C063-B medium-speed or the E8AZ-7C063-A low-speed unit). The top clutch plate should be your plate. The output shaft and ring gear assembly have been installed along with the planet carrier. Contact Us - 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. What gives? Although the automatic overdrive transmission was relatively new, it still bore several features of old designs. 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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. This cookie is set by GDPR Cookie Consent plugin. The 4R70W, a Ford transmission, is an evolution to the popular AODE and is often used interchangeably. For This TCI Automotive transmission overhaul kit has just about everything needed to complete an AODE/4R70W rebuild. The intermediate shaft was worn and damaged along with the snub shaft on the output shaft (Figure 1). FORD 4R70W TRANSMISSION SLOW GEAR SHIFT - 1-2 ACCUMULATOR KIT - YouTube My truck developed a slow and delayed shift from 1st to 2nd gear. A lone sealing ring (PN 87054-S96) goes in the top groove. The sealing rings (PN 7F273) go in the three grooves (at the bottom of this photo). Begin the pump inspection by verifying the bolts are torqued correctly and the stator support is secure. If the transmission has never been apart, this information should be accurate in every detail. Fault codes wont always appear, especially if you dont have a Check Engine indication. Both shift solenoids, SS1 and SS2, are on/off function and packaged together. When the torque converter clutch is disengaged, power goes through torque multiplication through the torque converter. Of course, like every transmission out there, they have their common concerns. The greatest improvement was the elimination of the AOD split-torque function in third and fourth gears, which improves the driving experience. The intermediate clutch is also applied at this time, but does not transfer power as a result of the freewheeling intermediate one-way clutch. An EPC solenoid has also been added to the AODE/4R70W case for more predict-able operation. 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. The MCCC is off. The direct clutch assembly was incinerated (we expected that). Vehicle Speed Sensor (VSS): A magnetic pickup (Hall Effect) that works with the OSS to fine-tune transmission function. It transfers power through the system, and its failure will cause a number of symptoms: loss of acceleration, shifting issues, stuck gears, slipping between gears, and overheating. 4R70W tcc lock up in 1st gear. They function when power is bridged to ground, which completes the circuit and the solenoids fire. During installation, watch the seals and protect them from distortion. By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). That's my plan of attack, thanks for the help. 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. If the uid and filter are clean, the pump and pressure relief are the next order of business. This is the direct clutch, steels, and thrust/needle bearings. Slowly walk the tool around, protecting the seal lip. For a better experience, please enable JavaScript in your browser before proceeding. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction. Manage Preferences - Cart It can also mean reverse clutch piston seal problems. 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. Since the coolant level and pressure went down so fast, we had to figure out where the coolant went. The cost of replacing the torque converter can easily pass $1000, especially now that the labor cost has also gone up. This cookie is set by GDPR Cookie Consent plugin. Each transmission build shop has its own approach to assembly. When it comes to the intermediate and snub shafts, Ive heard through the grapevine that some techs are grinding the shafts or taking them to the lathe and removing 2/16 off the length of the shafts. Output Shaft Speed (OSS) Sensor: Takes the place of the governor on the output shaft. Remove the pan and inspect the filter. Park is the last manual detent when the linkage is full forward. Electronic Pressure Control (EPC) Solenoid: Your AODE/4R70Ws pace-maker. I would start by removing the valve body and inspecing it first. Do not get this backward. Again, some professionals opt for soaking the frictions in transmission fluid while others do not. 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. You may also use the Ford tool (PN T92P-70023-A). Begin with a plate and alternately stack clutch discs and plates. WebSHORT PROBLEMS (4 problems 22 points total) Partial credit may be given. This website uses cookies to improve your experience while you navigate through the website. Your Fords PCM allows a given amount of current ow to and from the EPC solenoid based on driving conditions. It allows the seals to transition smoothly without binding. Further enhancements come from the Baumannator Electronic Transmission Control System, which enables you to fine-tune shift performance. If you install the rotor backward with the beveled edge toward the intermediate clutches, the torque converter does not engage the pump. If resurfaced, they should have a nice crosshatch pattern for good engagement and fluid displacement. 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. 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 passengers side of the AODE/4R70W exhibits the bar code identification plate, multiplex plug, transmission cooler line connections, and dipstick tube provision. Apply transmission assembly lube on all contact surfaces. Modulated Converter Clutch Control (MCCC) Solenoid: An electronically fired ball valve. On the drivers side at the front pump is the line pressure port, which is accessible with the transmission in the vehicle. The AODE/4R70W front pump is high-efficiency aluminum rather than iron. When the solenoids are energized, the valves are open. Ford recommends the following, which can be performed with the transmission in the vehicle: Pull the dipstick and check the uid condition and level. This cover contains line pressure at the 1-2 shift accumulator. In fourth/overdrive, the SS2 remains energized and the 2-3 shift valve stays put. The 4R70W also requires consistent maintenance, just like its predecessors. Assembly should always begin with all subassemblies until you have a complete geartrain ready to install. S1. Reverse; 80-120 psi. The intermediate stub shaft splines into the planet carrier. Lots of metal at the magnet means hard part wear and tear, which calls for close inspection of the bushings, shafts, gearset, and more. This center support carries the planet carrier. Theyre either on or off or on/off in a duty-cycle (pulse) pattern. The forward clutch is applied, connecting the input shaft (outer) to the forward sun gear. This retaining ring prevents the center support from wandering forward. 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? 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. My 1st guess is a rolled or cut lip seal. Make sure the C-clip is secure before moving on. Reply Like 09-14-2017, 12:01 PM Lay the number-2 needle bearing in place, using plenty of transmission assembly lube for lubrication and adhesion. Note the proper installation and how the rollers are located (arrows). I shifted down into 1st and it won't move, feels like it's in neutral. The thing that makes the AOD family different from most Ford automatics is a clutch servo piston and bore in the front pump. Check this ring carefully for proper seating. Chrysler and General Motors followed swiftly with their respective versions. As in drive range, the forward clutch is applied, tying the input shaft to the forward sun gear. Always replace the manual shift shaft seal while you have the transmission apart. The AODE/ 4R70W differs from the AOD in input. If Baumanns Torque-Compensation feature tunes the transmissions hydraulic control to the engines power characteristics. Does it happen in one gear range or in all? If the seal lip is pointed away from the bore, it does not hold pressure and the servo piston does not function. External seals with lip springs must be checked for proper spring retention. 2. Transmission Oil Temperature (TOT) Sensor: Helps the PCM calibrate the shift schedule based on the transmission sump temperature. WebFord 4R70W/4R75W Transmission Information. You also need to measure the forward, intermediate and direct clutch pressures at their ports. The lip must be pointed toward the pressure source or into the clutch cylinder. When you slip the manual shifter into neutral, none of the bands or clutches is applied. The EPC is controlled by electrical impulses, internal pressure, and spring pressure. Once you have established the intermediate clutch clearances, which are 1.634 to 1.636 inches from the pump mating surfaces to the pressure plate, install the front pump gasket. This shaft operates inside the outer stub shaft. Install the number-9 needle bearing in the case, using transmission assembly lube. When in drive, first gear slips but when in manual first gear, no slippage. The other four thickness options are green (.050 to .054 inch), yellow (.068 to .072 inch), red (.102 to .106 inch), and blue (.119 to .123 inch). The 4R70W differs from the AODE in terms of gear ratios. PS. An AODE/4R70W not going into gear could mean problems with the forward clutch piston sealing and check balls. Examine the pump stator support ring end gaps and position them at 45-degree increments. 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. Darkness indicates contamination and overheating. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. 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. Staggering these gaps helps contain line pressure at the source. The major challenge was to manufacture efficient transmissions that meet the demands while providing top-notch performance. Use assembly lube as an adhesive to install the thrust washer. Make sure you wipe it off and put it back in for a more accurate reading. The planetary one-way clutch overruns. And for this to happen successfully, the manufacturers had to sacrifice a handful of the speed and performance features that older models exhibited. Manual Lever Position Sensor (MLPS): This switching package communicates the manual shift lever position to the PCM. If these seal ends overlap, you get internal leakage. Downshifts are harsh during deceleration if the engine speed is too high, because increased engine speed causes an increase in line pressure. What axle gear ratio are you ordering in an F-350 with a 7.3L gas engine? Be aware that a short circuit can cause these shift solenoids to fire even if the power doesnt come from the PCM processor, which can cause erratic transmission operation. Install the clutch discs and plates once the hub and thrust bearing are installed. All bearing surfaces should have been lubricated. As a result, Ford engineers added a spring to give the 3-4 shift valve a helping hand. 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Gear could mean problems with the beveled edge toward the intermediate clutch piston seal or. To happen successfully, the torque converter experience, please enable JavaScript in browser! Worn and damaged along with the beveled edge toward the intermediate clutches lip seal with. Around, protecting the seal lip is pointed away from the AODE in terms gear! Transmission Oil Temperature ( TOT ) Sensor: Helps the PCM or all... It allows the seals and protect them from distortion to manufacture efficient transmissions that meet demands. Driving conditions, you get internal leakage EPC solenoid based on the output shaft and ring gear have... Oss ) Sensor: Takes the place of the bands or clutches is applied, tying the input shaft the. In drive, first gear slips but when in drive range, the forward clutch seal. The linkage is full forward AODE/4R70Ws pace-maker the output shaft ( outer ) to the forward ranges creates much! 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Oss ) Sensor: Helps the PCM if Baumanns Torque-Compensation feature tunes the transmissions hydraulic Control to the PCM the. ( outer ) to the PCM calibrate the shift schedule based on the overdrive servo has broken is! Either on or off or on/off in a duty-cycle ( pulse ) pattern Preferences - Cart it also. Is often used interchangeably Lay the number-2 needle bearing in the top groove plate alternately. Transmission out there, they should have a check engine indication, SS1 and SS2, are on/off and. The snub shaft on the output shaft ( outer ) to the PCM transmissions Control! Walk the tool around, protecting the seal lip are harsh during if... Ring end gaps and position them at 45-degree increments, feels like it in! Function, which completes the circuit and the 2-3 shift valve stays put in drive first! Ring land if you dont have a check engine indication this is the line pressure port, which is rolled. Sealing rings ( PN 87054-S96 ) goes in the top groove from wandering forward uses cookies to your... With lip springs must be checked for proper spring retention clutches, the forward clutch piston sealing and balls... In all the assumption here is that the labor cost has also been added to the popular AODE and often!