TMGT
Elite Member
Yes, but the caviot is that the trans logic has to be right. I loved my Cummkms/Allison combo in my rollback, buddies almost identical truck with the Cat/Allison combo is not even remotely as good, part of it is the way the Cat c7 pulls but i think a major part is the trans just doesn't shift right to me. Both are the 5spd, 6 are even better.I’ve never driven a medium duty with an automatic other than a bus. You think they pull better? I have a 5500 with an 8.1 with an Allison behind it but it’s been non operational every since I’ve had it.