6.7L Cummins and Allison auto into 80 series (1 Viewer)

[mudbludger]

Hello all, I have seen a few 6bt conversions into the 80, but has anyone tried the 6.7 ISB? Would it even fit by it self or with the Allison gearbox....

 

[Landseer]

Theres a thread from many years ago where someone started doing a Duramax V8 with Allison transmission swap before deciding to do a Chevy V8 swap instead. If I recall correctly the Allison transmission did fit. However, the 6.7 ISB would likely need a body lift to fit. Whether the rest of the drivetrain would be able to handle the torque of the 6.7 is questionable.

 

[mechanist]

Isn't it too big? That Allison is long...

 

[mudbludger]

The front and rear diffs can be beefed up a bit but would still have to be used carefully.... I did some research and one had been fitted to a 105 series however the front prop shaft would not clear the allison so it was abandoned.

I doubt the A442F could be setup to handle the Cummins

 

[bloc]

Marks 4wd mentioned a duramax being swapped into a cruiser with a 6L90 because the Allison wouldn't fit. Supposedly the dmax had this transmission in 3/4 and 1-ton vans in the states...

 

[mjosoba]

I would ask why? Our 6.7's at work are nothing but problems and return horrible fuel mileage. The 5.9's are still kicking and get way better power with a barely noticeable loss in power.