Cummins/ Allison Combo
the allison in the 4900 intl I was driving had park. and that was behind a 466e.
Personally, I'd not bash Allison. What I would say though is that you would need to pair the cummins (ISB is a medium duty motor) to the heavier Alli - a 2000 or 2500 if memory serves because the one GM uses currently is specially made for the DMAX.



