4L60E to 4L80E conversion in a GMT900

[farmtruc]

glad it's helping others.

i really need to update this thread, things have changed so much.

[luisdavid]

glad it's helping others.

i really need to update this thread, things have changed so much.

farmtruc, would you happen to know what could cause my tow haul to not work after the 80e swap? any help is appreciated.

[Three6GMC]

Know this is a old thread but wanting to do the 4l80 swap on my 2011 GMC Sierra that has the 6l80 and autotrac transfer case. What all is needed to buy for this? Did you guys fig out the 4x4 issues? Im pretty sure i won't have any issues fitting my transfer case to the 4l80 as its the same input and bolt pattern as an Atlas transfer case from what I'm told and trans adapters has the right adapter for it already. Will it still work and function correctly tho? Also I wouldn't mind dropping the truck off at Nelson if he can do the whole swap for me as long as everything still works 100%.