Guest Posted November 8, 2002 Share Posted November 8, 2002 I've got a performance buick 350 and a TH400 in my 79 regal. I need more strength in the rear end. Is it possible (and if so how) to put a 12 bolt or 8.5'' rear end in a G body chassis? Link to comment Share on other sites More sharing options...
NTX5467 Posted November 9, 2002 Share Posted November 9, 2002 I believe the 8.5" ring gear rear axle was part of the GNX package and might have existed under a limited number of other A/G bodies over the years.The 7.5" axle is used in a whole lot of 78-87 A/G vehicles and S-trucks. Interestingly, in the later model S-10 pickups and small Blazers, if you ordered a 4.3L V-6 with a 5-speed manual trans, you got the 8.5" ring gear 10-bolt rear axle. Many of the S-Blazers had rear disc brakes too regardless of which axle was under them. I'm not sure how the spring mounts and widths might compare to your application, but the S-Blazer 10-bolt might provide the core from which to build what you perceive you need. Might also be some Ford 9" rear axle possibilities too.Some of the performance guys/racers (including our Moderator) might have some more information for you.Enjoy!NTX5467 Link to comment Share on other sites More sharing options...
Jyrki Posted November 13, 2002 Share Posted November 13, 2002 I know that the 84-87 T-Types came with a 8.5" axle with 3.42 gears and posi, and that's a direct swap into any 78-87 G-body. However that S-10 thing I know nothing about.Jyrki Link to comment Share on other sites More sharing options...
NTX5467 Posted November 14, 2002 Share Posted November 14, 2002 I mentioned the S-10 deal as that would generate rear disc brakes for an 8.5" rear axle that would go in the same place as a 7.5" rear axle. Similarly, the rear disc brakes on the ImpalaSS/Caprice cars are bolt-on situations for other 8.5" rear axles unlike the earlier rear disc brakes on the '79-'81 Firebirds which needed a special rear axle (with cast in caliper mounts) for the rear disc brake setup. In this case, all of these comments would apply specifically to Chevrolet rear axles.NTX5467 Link to comment Share on other sites More sharing options...
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