Mark,
I don't have a lift kit on my truck, but I did add a supercharger because of the downshifts that were occuring on every small hill on the interstate.
It is a completely different truck with the supercharger. It basically walks right up hills without drastic downshifts. On steeper hills, it will unlock the torque converter, but that is only a couple of hundred RPM.
The supercharger did not require the crankshaft to be pinned.
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