6 Speed Allison transmissin
Hi to all fellow travelers, My wife and I recently purchased a new to us HR diesel pusher. It is a 98 with a Cummins and the 6 speed Allison tranny. In general the transmission shifts very smoothly...
Forum Discussion
I had the same hard down shift problem from 4th to 3rd when I changed out the fluid to full synthetic and the transmission did not recognize the fluid so I had a Allison dealer reset the transmission back to factory spec. so it could learn how to shift all over again. I believe they call it resetting the fast adaptive in the Allison computer.....
