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While talking about the PTO forward and reverse issue something came to mind. If you run a deuce t-case PTO in reverse, will the PTO lube pump work? I'm thinking yes because I think it's a piston pump but I'm not sure. I've never had one apart.

If you put the trans in reverse, the M939 truck's t-case PTO will go in reverse. It won't run the hyd pump like that but it will turn backwards. The low range reverse lockout may prevent this from happening in stock form but I'm not sure (mine has been disabled).

The t-case PTO will spin one direction with the trans in forward gear and the opposite direction with the trans in reverse (I'd have to go out and look at the truck to tell you what direction it spins in which gear). With the M939 trucks, the engine pretty much has to be ran at governed speed...

Not if you put the trans in reverse. That doesn't give you power down. If you spin a hyd pump backwards, it will do nothing but burn up if you run it backwards very long. Power down is accomplished in the valving and has nothing to do with PTO rotation. I'm not saying they don't make one...

The m939 trucks have a trans PTO that is only rear output and is single speed, in one direction. The only thing it's used for in OEM configuration is to power a hyd pump for the front winch. I will add that the OEM hyd pump has more than enough capacity to run other hyd driven items also (around...