[mike nixon]

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

[Keith Seymore]

Yes -

http://67-72chevytrucks.com

There is a specific message board for 73-87 pickups.

K

[Mark1968]

Originally Posted by mike nixon

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

RE the rear end, the center section pulls out from the front side as opposed to the back, like a 10 or 12 bolt. I was assuming.

[mike nixon]

Originally Posted by Mark1968

RE the rear end, the center section pulls out from the front side as opposed to the back, like a 10 or 12 bolt. I was assuming.

At some point that's been changed. As mentioned above It's probably an Eaton unit unless someone had a custom unit made.


MIke