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RE: Air to transfer H20M139. The sprag units on your truck are not functioning properly. With no air, the forward sprag should be engaged, and the wheel should not turn backwards. The banging noise you mention hearing in the other thread are parts binding, slipping and trying to break when...

RE: Re: M52 questions What looks like an airline running to the transfer case is an air line - if you have no air, it is very important that you do not attempt to drive in reverse. The airline controls the sprag selection - default is forward. Driving backwards with the sprag in forward can be...