4L60E to 4L80E conversion in a GMT900

[RedHeartbeat]

Has he tried putting the tcm programming from a suburban or Altons bro in laws truck into yours to see if it will control the tcase? Surely there is one somewhere that may work with your 80e.

[rutroe]

Not sure. I know Ray did some pretty extensive research. I will have to ask him and see. I think part of the problem is the "new" tcase had push-button controls and my truck has the dial. Not sure how much that comes into play.

[KHester84]

Not sure. I know Ray did some pretty extensive research. I will have to ask him and see. I think part of the problem is the "new" tcase had push-button controls and my truck has the dial. Not sure how much that comes into play.

This is not what I wanted to hear lol. Have you guys tried a 2008 HD transfercase that will mate up with the 4L80e? Don't give up yet!

I'm sure there are 2500HDs with a 6.0/4L80e/4wd option...just not sure if you can only get them with the shifter on the floor or the dial setup like we have...hmm?

[KHester84]

I've done some digging...looks like the 2008 trucks came with t-cases RPO code "NQH" for Gas Engine Transmissions and "NQF" for Allison Transmissions if my research is correct.

NQH = MP3023/3024
NQF = MP 1625/1626

Both of these units feature electronic shift controls.

http://www.gmpartsgiant.com/componen...mn8k20743.html

I'll try and decipher what the MP part numbers stand for as far as input spline count, etc.

I may be wayyy off here, someone please chim in so we can learn haha.


Well I've found an article that shows a 2008 2500 suburban with a 6.0L engine, 6L80e tranny (should have 32 spline output) that uses the MP 3024 tranfer case with the dial selector on the dash: Motor Trend Article Page 4

I also found this magazine article that lists specific DTCs of the MP 3023/3024 tranfer cases: Transmission Digest Article Page 18

[CHEVROLADE]

ill have to do this swap soon...about how much am i looking at total?and what year of 4l80e am i looking for?its going on my 08'2wd