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Old 12-30-2019, 11:36 AM
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1976 Grand Prix 455 1976 Grand Prix 455 is offline
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Join Date: Jul 2019
Location: Kettering, Ohio
Posts: 38
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Quote:
Originally Posted by fireprix View Post
These did come in some GPS. My 75 has one from the factory. Aftermarket support is zero. Shame because they’re pretty strong. Mine has 31 spline axles but has C clips. Steepest gears are 3.42. There used to be a machine shop in Texas that made 3.55 gears for these to fit the most common 2.78-3.08 carrier. I upgraded mine from 2.56 open to 3.23 posi but searched for years to find good used gears and rebuilt carrier.
I gave up on trying to find anything like that for the reasons you stated. I can make my 10 bolt strong enough for what I plan on running at the track for half what it would cost for a fabricated Ford 9" from Moser. Putting a 9" in my Grand Prix is akin to blasphemy in my eyes. lol

The ironic thing is my car actually came with a posi rear end (1 of only 3 options the car has on it.), but the gear is like a 2.27:1. I'd use the existing carrier, but I don't trust the 44 year old 28 spline axles with a 455 in a 4000# car running deep into the 12's.