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I have checked the shut down cable/ reset.....i have removed the solenoid as it was NOT resetting which resulted in hard to no starting. Problem is only when the truck is moving FORWARD from a dead stop. Once rolling it shifts fine up and down the range. But depressing the pedal from a dead...

I have checked the transfer case button....have engaged and disengaged the transfer case in the low/high range and my truck still is slow to move when pedal is depressed EXCEPT in reverse. It has instant throttle response in reverse. Seems to be a common problem. I'm working thru the process...

Glen...my M923A2 suffers from that as well.....still trying to work thru it...several threads here on M939 SERIES allison problems....I feel like they are all similar is the problem...stalls or VERYslow off the line til it gets rolling. Once we find the issue i feel like we will solve several...