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Who or which post is this in response to? The hard shifting transfer case is common across the 939 series not just the 936 and is generally because of the interlock switch or piston not functioning properly.

OK guy's here's the thing the transfer case shifter should move easily from high to low easily if it is adjusted and lubricated properly. If you are having trouble shifting it, start looking for a problem.

Yeah that's what is supposed to happen but I have one that will take off with pto engaged! So it could happen, but hopefully not. A lot of wreckers are sold missing parts and mine was missing a safety feature, the brake auto lock.

Okay so I will play devils advocate here and say don't disable the shifter lock on a wrecker, other trucks sure, I know it is unlikely to happen but the wrecker is the main one that will be running with the transmission in gear and t/c in neutral and no one in the driver's seat, if it fell back...