FWIW the diff isn't a dana 60 in the rear unless it's an oddball. It'll be a 14 bolt corprate which is stronger than the Dana 60.
MY 78's had several powertrains in it. The current one is a 6.2 diesel with a pump that's turned up to the ragged edge of being a coal burner a 4spd manual trans, 4:10's and 33"'s. It pulls 22 mpg on a regular basis, 13 pulling 13k lbs against the govenor.
I'l agree on the t/case conversion, it's the best move you'll ever make for fuel economy and drivability. A good set of headers and a free flowing exhaust will gain you 1-2 mpg. In stock form mine ran 13 with a 350 / turbo 400 / 4:10's 33" tires. Lockouts and headers got it up to 16 during warm weather with a 350 that dyno'd out at 479 ftlbs of torque @ 2900rpm.
These are some of the best trucks GM ever built.
Mike
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so many pontiacs, so little time..................
moderator is a glorified word for an unappreciated prick..................
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