4L60E to 4L80E conversion in a GMT900

**KHester84** · 10-26-2010 11:22 PM

Originally Posted by rutroe

Latest update (Allen can give you specific details but it was my truck they were working). We had to go with a 3/4-ton transfer case. The stock tcase (MP3023) would not work. They tried a different input shaft and different planetaries but the case itself would not work with the new parts. 4x4 does not work right now but it's just a switching/electronic issue. No appreciable difference with the 80e versus the 60e. The insurance factor is nice to have though!

Have you gotten the 4wd to work yet? I'm thinking about going FI and want to swap to a 4L80e with existing 4wd before I start slapping a turbo on the truck. PM me your cost so far on the parts/labor if you don't mind. What did you do about drive shafts?

Thanks

**RedHeartbeat** · 10-26-2010 11:34 PM

I haven't done a 4x4 80e conversion. I think NelsonPerformance has done one. I did all my own work so no labor expenses just the cost of the materials, $1200 trans, $900 Vig convertor, modify the crossmember, modify the wiring, change the TCM programming and swap to an 80e/TH400 yoke. The costs are whatever you can get your parts for.

**rutroe** · 10-26-2010 11:51 PM

Originally Posted by KHester84

Have you gotten the 4wd to work yet? I'm thinking about going FI and want to swap to a 4L80e with existing 4wd before I start slapping a turbo on the truck. PM me your cost so far on the parts/labor if you don't mind. What did you do about drive shafts?

Thanks

They are still working on the pinouts. I'll post up when everything is working.

**pl4yboy** · 10-27-2010 12:29 AM

Originally Posted by rutroe

They are still working on the pinouts. I'll post up when everything is working.

Please do. I am extremely interested.

**KHester84** · 11-17-2010 03:11 PM

Originally Posted by rutroe

They are still working on the pinouts. I'll post up when everything is working.

Well...no post in a while so I guess your truck is still 2wd? lol

**rutroe** · 11-17-2010 06:15 PM

Allen has been busy and my schedule hasn't allowed time to go by up til now. I'm stopping by on Friday so they can work on it. But yes, still 2x for now. I'll post an update this weekend.

**rutroe** · 11-26-2010 09:52 AM

OK, new update...the 07 NNBS 4x4 architecture doesn't talk to the new transfer case so we will have to move to plan B...AWD conversion. I'm gonna charge Allen for the Goof Off I need to remove the Z71 4X4 stickers off the back end...

**RedHeartbeat** · 11-26-2010 12:28 PM

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** · 11-26-2010 01:46 PM

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** · 11-29-2010 11:54 AM

Originally Posted by 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.

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?

Thread: 4L60E to 4L80E conversion in a GMT900

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