Sierra 3500 2WD V8-6.0L (2008)
3. Push the main transmission connector (2) outward through hole (1) in the transmission case until the retaining feet on the connector are near the
locked position.
4. Use J 44247 to seat the retaining feet on transmission connector (1).
5. Install the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement (See: Fluid Pan/Service and Repair/Allison - Automatic
Transmission) .
6. Connect the external wiring harness to the main transmission connector.
Important: The FastLearn, adapt, procedure must be performed. This can be done in 1 step using a scan tool. If this procedure is not
done, the TCM adaptive values will be at the settings that it learned for the old components and will be in slow adaptive mode. Under
these conditions, it will take an unacceptably long time for the adaptive values to converge to levels suitable for the new transmission.
7. Perform the FastLearn procedure. Refer to FastLearn Procedure (See: Testing and Inspection/Component Tests and General Diagnostics/Allison -
Automatic Transmission/FastLearn Procedure) .
