I am needing to know what it would consist of to do this swap in a rcsb Silverado with a 5.3L/4l60e combo. I will be doing a 6.0L swap at the same time as the tranny. Is there any way that I can just swap pcm/ecm's of the two combos and everything work properly? Thanks- Preston

 

If you swap in the 6.0 80e and the pcm you will be in good shape.

 

Did you already get the stuff for the tranny swap? I'm going to do mine soon and probably get the parts from Speed Engineering except I'm going with the GM 4L85E

 

Like he said if you get the PCM with it you will be good. You will just need the wiring harness adapter. You can also get your PCM tuned for it if you dont get the one with the 6.0 and 80e.