Join Date: May 2003
poconojoe is offline
Re: 4L60E torque converter lockup?
You'd be better off having the PCM reflashed with lockup settings that suit your driving. The lockup switch on the newer full size trucks goes to an input on the PCM and it is programmed to use it. You could switch out the PCM and harness from one, but it wouldn't be worth the work. There is also aftermarket tranny controlles out there, that you could use. Locking it up is going to make the truck's acceloration slugish. If you manually lock it up the PCM will set error codes.
PS The newer trucks keep the convertor unlocked, not locked and if you have the allison, you can also set it to stay out of high gear