Ok first off it's an 04 Silverado 1500, I'm using EFILIVE with custom OS 2, and of course I did the 4L80e segment swap. We've done many other 4L80e swaps and never had this problem before. The only thing I did different is not wire in the front input speed sensor, but I did turn all the DTC processing enablers off for it and disabled all the slip test stuff too. Shouldn't this work? It drives around just fine at all part throttle driving and the 2>3 WOT works fine too???? Also this trans was taken from my '89 turbo LS swapped truck and worked fine in there....

 

It needs the front input speed sensor hooked up, at least to the best of my knowledge. Someone else recently had this problem also.

 

I had that problem. hook the VSS up. When I didn't have mine hooked up no matter what was changed in EFIlive nothing changed in the trans. hooked it up and all went to how it was tuned for. I have also broke an VSS wire and the shifts were really hard, but that was one wire hooked up and one broke. nether hooked up it wouldn't shift at all.

 

Kinda what I had figured... ok thanks guys!!

 

You already did the trans swap on Jeremiah's truck?

 

Yup! Got it done last night, other than the iss wiring

 

Cool. I miss that truck. Should haul *** now!

 

Gunna do a little work to the nitrous system yet and throw a nice hit to her and see how it does, converters only a 3500 now but setup to work well with the n20.

 

Installed the ISS and works perfect now!