This shaft operates inside the outer stub shaft. As the 4R70W evolved to the 4R75W, an input shaft sensor was added. Step 7: Seat Direct Clutch The planet carrier can be seated into the ring gear and direct clutch with a little twisting of the small input shaft, which is splined into the direct clutch. Darkness indicates contamination and overheating. Shake the governor back and forth to ascertain valve freedom and movement.
Make sure the C-clip is secure before moving on. It is the reverse clutch, which houses the reverse clutches and splines into the forward clutch and input shaft. Torque the extension housing bolts to 16 to 20 ft-lbs. This Tech Tip is From the Full Book,. Between the snap ring and anti-clunk springs, the center support should be secure. Rough surfaces should be dressed until smooth and serviceable.
Pressure causes the lip to seal. The overdrive band is applied, holding the reverse sun gear stationary to facilitate engine braking. With the lip pointed toward the pressure source, you get a fail-safe installation because pressure holds the seal lip against the sealing surface. Step 5: Install 1-2 Shift Accumulator This is the 1-2 shift accumulator, which also stores pressure for a more solid upshift. Seat them into the ring gear and direct clutch.
Step 14: Install Number-3 Thrust Needle Bearing The number-3 thrust needle bearing installs inside the forward clutch hub. Step 5: Install Reverse Clutch Pressure Plate Install the pressure plate and snap ring last. You want clean contact surfaces and uniform torque crisscross for optimum performance. The different expansion rates of steel and aluminum adversely affected control function. It has a different main case, valve body, torque converter, front pump assembly, input shaft, and other vital components. As with clutch discs, the low-reverse band should be lubricated with transmission fluid for installation. As acceleration begins from a stop, fluid under pressure flows through the torque converter in the conventional manner via impeller, stator, and turbine.
Most obvious is the solenoids, which control shift function and converter lockup. Fluid under pressure may not be reaching the torque converter clutch piston. The wide-ratio 4R70W gearset improves acceleration with a 2. Step 6: Install Center Support Install the center support and planet carrier. Chrysler added overdrive units to existing 3-speed automatics: the 904 and 727. The bushing should also receive generous amounts of assembly lube. If it is brown or otherwise dark in color that is a clue.
Use an abundance of transmission assembly lube. Step 6: Install Reverse Clutch Pressure Plate Install the reverse clutch pressure plate against the Belleville spring. Snap rings of varying thicknesses are available to get the clearances right. The vacuum modulator finitely controls line pressure. Step 3: Install Direct Clutch Piston Press the direct clutch piston into place using seal protectors to safeguard the piston seals.
You will likely have to rock these assemblies back and forth to get them to seat. Hard parts are rugged and can typically survive several overhauls. Step 6: Torque Valve Body Bolts Torque the valve body bolts to 80 to 100 in-lbs beginning with light hand tightening to seat the valve body, then torquing in one-third increments. The harness protects the wiring. Step 2: Rebuild Governor Disassemble, clean, and inspect the governor, which is mounted on the output shaft.
Give these rings and grooves abundant lubrication. Step 13: Install Forward Clutch Piston Return Springs Use a C-clip retainer with the clutch piston return spring. Step 3: Install Direct Clutch Piston Return Springs You can use C-clamps or a spring compressor to compress the springs and install a C-clip. Step 9: Install Pan Torque the bolts to 6 to 10 ft-lbs. It also has the benefits of two gearsets in one, which offers some weight reduction and engineering simplicity with fewer parts. The vacuum modulator finitely controls line pressure. Give these rings and grooves abundant lubrication.