I'm in the process of finishing up my 4l80e swap but I need a to figure out what to do on the HD file segment?


As of right now the 80e trans is in and I purchased the Speartech wire harness with the vss connection. I've done some research and from what I gather I need my tune plus an Hd file that's closet to my tune which I then send off to Hptuners to have them do the segment for me?

The thing is on the Hd file I'm not sure what I'm looking for I've look thru multiple threads and it doesn't really say what to look for just the closet to my tune?

Also which my stock to or my adjusted tune?


How do I attach my tune it keeps saying its invalid?