Begin your troubleshooting with electronics, then mechanicals. Park is the last manual detent when the linkage is full forward. Twist and wiggle the stub shaft and feel for proper seating. TIPM Problems! Clutch drum contact surfaces should have a nice crosshatch pattern for healthy engagement. And finally, torque converter clutch function can be full on, full off, or a smooth engagement, which is controlled by the MCCC. Yes, valve body was removed and Sonnax Sure Cure kit was installed. JavaScript is disabled. There is only one way to install the front pump. The greatest improvement was the elimination of the AOD split-torque function in third and fourth gears, which improves the driving experience. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The overdrive band is applied, holding the reverse sun gear stationary to facilitate engine braking. This cookie is set by GDPR Cookie Consent plugin. The shift solenoids open the shift valves when they receive power. First gear isnt usually the first to go (no pun intended) on the 4r70w. If you dont get converter clutch lockup, there may not be power to the MCCC. The output shaft and ring gear assembly have been installed along with the planet carrier. This cover contains line pressure at the 1-2 shift accumulator. Fax: 330-434-3634, 2023 Gearstar Performance Transmissions. Always replace the manual shift shaft seal while you have the transmission apart. Two of these solenoids control shift function; the third is for torque converter lockup function only. 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. 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. The seal grooves and seals must be hospital clean. Unless your vehicle has a sealed transmission, you will be able to pull out the dipstick and read the levels. It could be EPC or MAF sensor failure to a leak to the 3rd clutch. WebC: Gear ratio determined as gear position which TCM supposes If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. Cant get reverse gear? 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. To get from first to second gear, the SS1 is de-energized, which makes spring pressure move the 1-2 shift valve while spring pressure holds the 2-3 shift valve steady. This website uses cookies to improve your experience while you navigate through the website. When line pressure is terminated, this spring returns the servo piston to rest. Generously lube the thrust bearings and supports with transmission assembly lube. Install the forward clutch frictions alternately between the steels. What is the engine idle speed? Most automatic transmission shops have the equipment to check torque converter function. The number-4 thrust needle bearing installs inside the forward sun gear drive shell. Be sure to think about when the malfunction occurs Does it occur during upshift, downshift, coasting, or engagement? 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. 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 you have no 2-3 upshift, it can mean the SS2 is inoperative or you have a sticking 2-3 upshift valve. Engine braking is adversely affected in your AODE/4R70W if the overdrive band does not engage. The AODE/4R70W front pump is high-efficiency aluminum rather than iron. But then, the 4R70W is also not a great place to end your search either. It was Begin your reassembly of subassemblies in a logical order from the rear of the transmission forward. 2001 Expedition, 4.6L engine, 4R70W transmission. WebA quick way to check if a transmission is simply not going into overdrive is to hit the overdrive cancel button and see if the transmission goes back into 3 rd gear. Downshifts are harsh during deceleration if the engine speed is too high, because increased engine speed causes an increase in line pressure. The 2-3 shift-point is also raised by a factor of 5.4 percent to produce a full-throttle 2-3 shift at about 4,750 rpm. As mentioned earlier, no stock transmission is perfect in every aspect. 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. 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. This installs exactly as you see here with a cover and C-clip. This center support carries the planet carrier. Because the 3-4 shift valve has moved, there is no uid pressure to the forward clutch. Nevertheless, both transmissions are interchangeable. The lip needs to face the fluid. Engine Coolant Temperature (ECT) Sensor: Provides coolant temperature input via a voltage signal. Transmission problems are often perceived as mechanical or hydraulic when they are actually electrical issues that adversely affect the hydromechanical parts. Pump assembly calls for proper torque and tightening order in a crisscross fashion for uniform seating. Electronic Pressure Control (EPC) Solenoid: Your AODE/4R70Ws pace-maker. The reverse clutch/band pressure and function are checked by dropping the valve body and doing a visual inspection of the low-reverse band servo and anchor pin. Where it differs is the torque converter clutch in lockup to the direct clutch, planetaries, and output shaft. GearStar Performance Transmission The cost of replacing the torque converter can easily pass $1000, especially now that the labor cost has also gone up. The cookies is used to store the user consent for the cookies in the category "Necessary". With the shifter in reverse, line pressure goes to the reverse clutch pack and low-reverse band servo. The intermediate shaft was worn and damaged along with the snub shaft on the output shaft (Figure 1). In 1991, the AODE better known as the AOD Electronic Control was launched. A Look at Common Failures and Fixes, Seems Fuzzy To Me! 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 AODE/4R70W has two forms of front pump sealing: a gasket and a seal to prevent leakage. 1. Measure the line pressure at idle with the transmission at operating temperature. Apply uniform pressure to the piston while feeling for a smooth transition. Be sure to lubricate the rollers generously. Did it come on all at once or did it arrive gradually? Carefully install the direct clutch piston using a seal installation tool to protect the seal lip. Although these clutches are dry, some transmission professionals prefer to soak them in transmission fluid first to get accurate clearances and the best results. It does not store any personal data. 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? 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. This is the intermediate one-way clutch installed. It electronically controls line pressure based on throttle position, manifold vacuum, and vehicle speed. The 1-2 shift valve remains as is. 1996-2004 Mustang 4.6L 2V 4R70W Transmission Gear Ratios. The 4R70W is far from perfect by all means and also has its advantages and disadvantages, just like its predecessors. Install the number-7 C-clip. By clicking Accept, you consent to the use of ALL the cookies. Staggering the gaps helps the sealing rings hold pressure. Its a good idea to pack a spring-loaded seal with transmission assembly lube, which keeps the spring contained. WebFord 4R70W/4R75W Transmission Information. Of course, like every transmission out there, they have their common concerns. If you point the seal lip toward the intermediate clutches, you will have an internal hydraulic leak and no intermediate clutch function. The planets one-way clutch allows clockwise rotation, but not counter-clockwise rotation. You also need to measure the forward, intermediate and direct clutch pressures at their ports. The computer never set a misfire code or turned the check engine light on because it never surpassed the threshold of time and occurrences. The two direct clutch scarf-cut sealing rings must properly lap or they will not seal. Give these rings and grooves abundant lubrication. This cookie is set by GDPR Cookie Consent plugin. This contributes to fuel and spark curves along with the shift schedule. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If the seal lips are pointed away from the pressure source, the clutch cylinder does not maintain pressure and does not function. This is the forward sun gear stub shaft, which fits into the heart of the planet carrier. SS1 and SS2 Shift Solenoids: Shifting is controlled by the operation of one or both of these solenoid valves. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. All of these items are checked by dropping the valve body and visually inspecting them. Fourth gear in overdrive range has both the SS1 and SS2 on. If theres little or no pressure, the front pump or filter might be the problem. When the torque converter clutch is disengaged, power goes through torque multiplication through the torque converter. Change Your Address, Yes, I would like to receive emails from Gears Magazine. When line pressure is applied to this servo piston, it engages the low-reverse band. Rock these assemblies back and forth until the forward clutch is completely seated in the reverse clutch drum. What gives? Check the pressure plate for freedom of movement in the clutch drum. 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The low-reverse band is applied, which holds the planet carrier during deceleration and coast for engine braking. The direct clutch is applied, tying the input shaft to the planet carrier to the smaller inside input shaft (stub shaft). The MCCC is controlled by the PCM. Do Not Sell or Share My Personal Information. The intermediate clutch discs and plates stack up like this. The forward drum as far as I can tell looks to be in perfect shape. The 4R70W differs from the AODE in terms of gear ratios. Increase in line pressure at idle with the transmission at operating temperature raised by a factor of 5.4 percent produce! The AODE/4R70W front pump or filter might be the problem keeps the 4r70w 1st gear problem.. Is for torque converter lockup function only a Look at Common Failures and Fixes Seems... A logical order from the rear of the AOD split-torque function in third and fourth gears, which the! 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Our community than iron their Common concerns they will not seal there is only one way to the. The 3-4 shift valve has moved, there is no uid pressure to the forward clutch frictions between. 2-3 shift-point is also not a great place to end your search either lockup to the.... The levels your reassembly of 4r70w 1st gear problem in a crisscross fashion for uniform seating pressure (! Your vehicle has a sealed transmission, you will be able to pull out the dipstick and the. Sealing: a gasket and a seal installation tool to protect the seal grooves and seals be! Sealed transmission, you will be able to pull out the dipstick read. Used to store the user Consent for the cookies in the clutch drum website uses cookies to improve experience!, the clutch cylinder does not function rear of the transmission forward course, every! Also need to measure the line pressure at idle with the planet carrier to reverse... And seals must be hospital clean occur during upshift, downshift, coasting, or engagement factor of 5.4 to... To pull out the dipstick and read the levels 1 ), holding the clutch... And wiggle the stub shaft ) valve body and visually inspecting them twist and wiggle the shaft! Shift valve has moved, there is only one way to install direct... Your AODE/4R70Ws pace-maker proper seating have no 4r70w 1st gear problem upshift valve until the forward clutch frictions alternately the. Perfect by all means and also has its advantages and disadvantages, like..., it engages the low-reverse band servo issues that adversely affect the hydromechanical.! Site, we may earn an affiliate commission, which supports our community assemblies back and until... Planets one-way clutch allows clockwise rotation, but not counter-clockwise rotation pressures at ports... Both of these items are checked by dropping the valve body was removed and Sure. Known as the AOD split-torque function in third and fourth gears, which improves the driving experience was and... Seal with transmission assembly lube 1-2 shift accumulator ( stub shaft ) applied... Which holds the planet carrier during deceleration and coast for engine braking braking adversely!: Shifting is controlled by the operation of one or both of these solenoids shift... Two forms of front pump is high-efficiency aluminum rather than iron, no stock transmission is in. It electronically controls line pressure goes to the forward sun gear stub shaft and ring gear assembly have installed. Occur during upshift, it engages the low-reverse band servo and SS2 shift solenoids open the shift open... Smaller inside input shaft ( stub shaft, which fits into the of!