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That would help things greatly lol. Have you put those numbers into a gear ratio calculator yet to see about what the top sustainable crusing speed would be? Adding an overdrive trans probly wouldn't hurt either.

A cummins will die behind a 3spd th400 with 4.56 gears. It will need way higher gears or massive tires to get it to run in the rpm range that it likes to run in. Im dieing to put a cummins in my truck as well and have looked into it a good bit. From what i've come up with it cant be done for any...

How in the world are you guys getting your 6.2L's to run anywhere near as strong or stronger than a big block???? It's only supposed to put out as much hp and torque as a straight six or a 305ci.

If you have a 454 sitting around that runs good and you can afford the gas that it will gobble with the 4.56 gears then I couldn't immagine putting a boat load of money into fixing the worn out 6.2L since the 6.2 can never be made to run as good as the 454. Also the 454 will make your truck able...