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Yeah I was hoping it was the problem, but button operates as it should and you can feel solenoid clicking and hear air bleeding from transfercase. Engine/transmission operates fine in forward. I was thinking the valve body is sticking or a stuck forward clutch.

I read the manuals and dont see anything that would explain why the transmission would stick between forward and reverse or troubleshooting for a transmission that operates fine in forward but locks and bogs engine in reverse, anyone have any ideas? I may be mistaken but I think it uses the...

Checked the cable and it seems to be properly adjusted

29 or 30 which ever one doesn't have the winch. It also has the 250 cummins with the allison 5 speed auto.

a buddy of mine recently purchased a 5 ton dump truck along with two transports (which we are installing dump beds on) and a wrecker. Dump truck runs operates fine but when reverse gear is selected, transmission locks up and bogs engine. I disconnected transfer case output shaft and ran the...