I repowered my 2005 suburban with a built up 6.0L and installed a 4L80e. Reused the harness an Neutral Switch as well. Once everything installed I fired the unit up no problem. I purchased a tune from “Mail order Tune” to get me started and when I installed the new tune I am in a no crank situation. The tuner swears nothing in his tune would be the issue yet when I put my original tune back in, it will crank and start. Any advise of which direction to look would be greatly appreciated. If this is the wrong feed please direct me where to ask Please..

Also when I use my HP scanner it shows the transmission in D2

 

vats delete probly didnt process, had the same issue with that company. had to send to back and forth eventually my setup cranked and ran terrible. had local tuner take care of everything now works great.

 

Was the Burb a 4l80e originally? The harnesses are different from 4l60e to 4l80e https://ls1tech.com/forums/automatic...e-swap-12.html

 

it was a 4L60e originally. I bought the harness adapter and added the VSS sensor harness. Not sure what else. I am gone to try and do a segment swap on my own and troubleshoot from there

 

Yeah weird HPTuners shows trans in 2nd