Preliminary

PRELIMINARY

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. Adjust gearshift cable if complaint was based on delayed, erratic, or harsh shifts.
3. Road test and note how transmission upshifts, downshifts, and engages.
4. Check fluid level and condition.

VEHICLE IS DISABLED

1. Check for broken or disconnected gearshift cable.
2. Check for cracked, leaking cooler lines, or loose or missing pressure-port plugs.
3. Check fluid level and condition.
4. Check shifter linkage: Is cable connected to lever at transmission and does the lever move with gear change on the console shifter? If no movement, repair shift cable and or shifter.
5. With shifter in Park, attempt to rotate drive shaft(s) to ensure transmission output shaft coupler/flange is secure.
6. Check the transfer case operation (if equipped).
7. Raise and support vehicle on safety stands, start engine with transmission in 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.
c. If propeller shaft does not turn and transmission is not noisy, perform hydraulic-pressure test to determine if problem is hydraulic or mechanical.
8. Air pressure test the B1, K3, and B2 clutch circuits. Air Checking Transmission Clutch Operation
9. Check the TCM, Wiring, Valve body, and Solenoids (Utilize fault codes to diagnose if available).
10. Remove oil pan and check filter presence and condition (not plugged and seated).
11. If debris is found in the pan, tear down transmission and inspect all hard parts, Front Annulus Gear and Gear to Retainer and Input Shaft (Shaft to Retainer) etc., and clutches. If the hard parts did not show signs of damage replace the torque converter and filter.
12. Remove valve body, disassemble, and inspect Line Pressure Regulating valve for being stuck, clean and remove debris.
13. Check pump rotor for failed inner lugs that are driven by the T/C hub.