Preliminary

DIAGNOSIS AND TESTING - PRELIMINARY

CAUTION: A unique transmission fluid has been developed for the 8HP45 transmission. This fluid is NOT compatible with ATF+4 or any other current Chrysler transmission fluid. For specifics about this unique fluid see FLUIDS, LUBRICANTS AND GENUINE PARTS .

Two basic procedures are required. One procedure for vehicles that are drivable and an alternate procedure for disabled vehicles (will not back up or move forward).

VEHICLE IS DRIVABLE

1. Check for transmission fault codes using the appropriate scan tool.
2. Road test and note how transmission upshifts, downshifts, and engages.
3. Check fluid level and condition.

VEHICLE IS DISABLED

1. Check for transmission fault codes using the appropriate scan tool.
2. Check for cracked, leaking cooler lines.
3. Check fluid level and condition.
4. With the transmission in the Park position, attempt to rotate drive shaft(s) to ensure transmission output shaft coupler/flange is secure.
5. Check the transfer case operation (if equipped).
6. Raise and support vehicle on safety stands, start engine with transmission in the Park position and allow to idle for several minutes, shift transmission into gear, and note following:
a. If propeller shaft turns but wheels do not, problem is with differential or axle shafts.
b. If propeller shaft does not turn and transmission is noisy, stop engine. Remove oil pan, and check for debris. If pan is clear, remove transmission and check for damaged driveplate, converter, oil pump, or input shaft.
7. Check the TCMA, Wiring, Valve body, and Solenoids (Utilize fault codes to diagnose if available).