trans wont shift
12-06-2018, 11:28 AM
#1
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trans wont shift I did an 5.3 swap with 4l60 trans I used the factory harness from the 5.3 an everything runs fie but the trans wont shift I can manuly shift it but wont shift by itself its an brand new trans its from a 2002 Tahoe I have power on the trans plug
12-09-2018, 01:12 PM
#2
TECH Regular
Is the tire size and gear ratio set properly in the tune? Also the shift speeds? If you have a scan tool you can monitor the commanded gear and see if the pcm is commanding the shifts.