I run the cheap Supertech ashless stuff from walmart. One oz. per gallon and my truck is happy. In a VP44 truck i would try to stay away from used motor oil and tranny fluid.
If you find a 6 speed Cummins, it should have 3.55 gears in it. I don't know what my truck makes, the one in my sig, but the superchips flashpaq is supposed to add 110 HP and 205 ft/lbs of torque on performance tune. I still can get 22 mpg with it. The NV5600 6 speed is bullet proof, or almost...
I would trust it, the only think I would be worried about is the VP44 injector pump. I would hook up a scanner to it and see if it is throwing any death codes or any codes at all. If not it sounds like an okay deal.
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