4L60E to 4L80E conversion in a GMT900

[farmtruc]

Not sure exactly what determines an autotrac, but we're doing a 2007 4wd right now. It has the MP2303 transfer case, selectable range switch and nobody has the input gear for it.
But we have it all apart and i'm pretty sure we got the right gear coming in monday; we'll post up a how to or how it turns out.
The NP case has been done, as we know. As far as I know, this case hasn't

There were two options for this case, the 80e and 60e, the 80e has a 32spline and the 60e has the 27 spline.
The GM exploded pic shows the 32spline being an option, that's we ordered.

Can't wait to see it work!

[pl4yboy]

Not sure exactly what determines an autotrac, but we're doing a 2007 4wd right now. It has the MP2303 transfer case, selectable range switch and nobody has the input gear for it.
But we have it all apart and i'm pretty sure we got the right gear coming in monday; we'll post up a how to or how it turns out.
The NP case has been done, as we know. As far as I know, this case hasn't

There were two options for this case, the 80e and 60e, the 80e has a 32spline and the 60e has the 27 spline.
The GM exploded pic shows the 32spline being an option, that's we ordered.

Can't wait to see it work!

Let me know because I'm wanting to do this. I just didn't want to be the guinea pig and do it on my DD while I'm in school.

[PitchBlackC3]

Did that input work out?

What was the part number?

[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!

[KHester84]

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

[rutroe]

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]

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

Please do. I am extremely interested.

[KHester84]

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