12 bolt carrier............for what?

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12 bolt carrier............for what?

Postby WMACHINE » Mon Apr 04, 2011 2:10 pm

Okay Jim, what do we have here? Can you id it? 7/16 bolts, I don’t yet have the axle spline count. Suspecting a B-body unit. Any way to tell what series for gear ratios?


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Re: 12 bolt carrier............for what?

Postby monzaz » Tue Apr 05, 2011 3:43 pm

need the casting number for the sereis or measurement from the table to the machined ring gear flange will be in the 1" -2" range (IE 1 7/16")

Looks to be from a 12 bolt pontiac (or what they call a GM Corporate 12 bolt Full size car 1978-1984 will have 28 spline c-clip axles and a ring gear diameter of 8.75

1971-1977 were 31 and later versions were 28 some c-clip some bolt in axle ring gear diameter was 8.875

ALL used left hand thread 7/16" bolts

SOME very few 1973-1977 Monte carlo, El camino and Cutlass were optioned with these rear if you have the BIG motors. 11" drums too.
J D Race

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