The 1947 - Present Chevrolet & GMC Truck Message Board Network - Rear Axle Ratio Charts For 1967

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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

Quote:

Originally Posted by dlyons321 (Post 9122759)

Orange,
I understand everything other than the 12 bolt coming standard on 1/2 ton trucks. I have been under the impression that 1/2 ton got 10 bolts and 3/4 ton got the 12 bolts.
My truck is automatic and has Dana 44 with 3.07 gears in the front.

You may have it backwards. Some 3/4 ton diff had 10 bolts and the FF had 14.
Later than 67-72, S/15s had 10 bolt diffs, but that was coincidental and another type.
The 12-Bolt Truck rearend was different from the 12-Bolt Car diff, too.
I'm not expert on the EATON and HO52 rears. They were 3/4 ton iirc.

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

ahhhh I got it now. I apologize I'm a recovering square body guy. I bought this truck in July and I'm just now getting some real time with it. Thanks for your help!