72 3/4 ton rear axle...? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rod · 10-08-2005, 11:36 PM

Well

The corporate 3/4 ton and 1 ton diffs had 17 spline.
the heavy duty 11000 lbs special order 1 ton diff had 27 spline.
The dana 60 in these trucks had 30 spline.

BB 3/4 tons had standard equipment 3.54 ratio dana 60's. Optional diffs and ratios could be ordered. In some cases a posi /locker was not an available option if you had a BB. My BB 72 1 ton duallie has a eaton diff 4.10 and detroit locker factory optioned that way...on the glove box.

You could get either dana or corporate under a 3/4 4x4 or a 3/4 ton 2 wd. Leafs were available under both also..but no coils under a 4x4 or a longhorn chassied unit.

10-08-2005, 11:36 PM	#23
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Well The corporate 3/4 ton and 1 ton diffs had 17 spline. the heavy duty 11000 lbs special order 1 ton diff had 27 spline. The dana 60 in these trucks had 30 spline. BB 3/4 tons had standard equipment 3.54 ratio dana 60's. Optional diffs and ratios could be ordered. In some cases a posi /locker was not an available option if you had a BB. My BB 72 1 ton duallie has a eaton diff 4.10 and detroit locker factory optioned that way...on the glove box. You could get either dana or corporate under a 3/4 4x4 or a 3/4 ton 2 wd. Leafs were available under both also..but no coils under a 4x4 or a longhorn chassied unit. Last edited by Rod; 10-09-2005 at 12:05 AM.



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