4l60e 1-2 shift does not happen at WOT

[clinebarger]

Originally Posted by JNJchev77

Well, I changed the PCS out last week and no change!


TPS tested fine but I've read it could still be bad, so I am going to change out TPS and VSS, only because it's cheap and easy... Also, should have access to a programmer to mess with shift points, gear ratio, etc, but want to change the sensors first to see if that helps...

Changing those sensor will not help, The ratio in the tune NEEDS to be corrected FIRST.