8.5 inch open out of g body? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-01-2003, 06:21 PM
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Post 8.5 inch open out of g body?

i found what looks to be a 8.5 inch rear end, with no posi but looks like good gears..

it looks like it will bolt into a g body specifically my malibu..

what other cars older or newer came with the 8.5?

and what code markings should i look for ie production plant and year etc

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Old 02-01-2003, 08:00 PM
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8.5 came in all G bodies yours could have came out of a 1978 to 1988 Olds cutlass 442 Chevy SS monte carlo they where the only cars that came with 8.5 open rear end that I know of
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Old 02-01-2003, 08:23 PM
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any other older car like a a body?
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Old 02-01-2003, 09:02 PM
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It could have come out of a vehicle with a similar set up, but watch the upper control arm bracket angle on the rear end, make sure the angle is proper or you will have severe binding in your upper control arms.

Not all g bodies had 8.5" rears, infact most came with 7.5" rears. Even the Monte Carlo SS came from the factory with 7.5" rears. If yours was factory made for a g body it would have come out of a Buick Grand National or T types, I think the Hurst Olds and maybe the 442 Cutlass too. I'm not sure, but maybe a couple of other model g bodies also, but I don't think so, unless there was an optional rear end package or something.

Interesting that it is an open diff that you have, most, if not all g bodies that included 8.5's I thought had posi. I have been wrong before thou.

[ February 01, 2003: Message edited by: OddsNEnds ]</p>
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Old 02-02-2003, 03:51 AM
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the upper and lower control arm brackets on a A body are set on different angles . if you had the G and A body rear end side by side it would almost be hard to tell a part, until you tried too install one then you would notice the different angles.
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Old 08-31-2003, 04:32 PM
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Anyone know what rear end/gears came in a '84 Grand Prix? I know it does not have posi (when in the air, turning one wheel forwards turns other backwards)
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Old 08-31-2003, 05:08 PM
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OddsNEnds is correct in the applications for the 8.5" in the G-body.

dklong is correct in the A-body axle difference BUT this axle WILL fit with a little homework, use aftermarket trailing arms like the ones from South Side Machine, a slight amount of tweaking if your lucky and the A-body axle will fit right in- just check the spring mounting flange location it may also be slightly different.
BUT it will be wider than the G-body axle so a different offset wheel will be a cheaper alternative to shortening the axle housing.
The '84 Grand Prix axle could contain anything between 2.41 and 3.42. If you can still read the stamped code in the housing tube send me a message and I can tell you what it came with from the factory.
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