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- Check for transmission Diagnostic Trouble Codes (DTCs) using the appropriate scan tool.
- Check for cracked, leaking cooler lines.
- Check transmission fluid level and condition.
- With the transmission in the Park position, attempt to rotate drive shaft(s) to ensure transmission output shaft coupler/flange is secure.
- Raise and support the vehicle, start engine with transmission in the Park position and allow to idle for several minutes, shift transmission into gear, and note following: Refer to HOISTING, STANDARD PROCEDURE
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- If propeller shaft turns but wheels do not, problem is with differential or axle shafts.
- 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.
- Check the Transmission Control Module Assembly (TCMA), Wiring, Valve body, and Solenoids (Utilize DTCs to diagnose if available).