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Author Topic:   GM Rearend under a GM Metric Car
Dirt Forum Racer

Total posts: 82
posted July 26, 2005 08:54 AM  
Right now I'm running a 7.5" 10 bolt under my metric Monte Carlo - good axles, mini-spool, and it works fine except in the future I can see wanting a higher ratio. If I'm in a class that requires a GM rearend for my GM car do I have any BOLT IN options? I'm not talking rewelding mount points or shortening anything - a straight bolt in solution. I have access to a 12 bolt out of 69 Chevelle - I have not measured that yet. Is something like that a possibility or are the mounts and widths way off? This will be an offseason thing so I'm just looking for advice at this point. Thanks for your help - Jim

Dirt Freak

Total posts: 374
posted July 26, 2005 09:01 AM  
Why not just run a glide in low?

Dirt Freak

Total posts: 302
posted July 26, 2005 12:14 PM  
if u can find a buick grand national they came with a 8.5 rear end but gears only go up to 5.57. its the same lenght as the 7.5, but they are hard to find and cost a lot. A lot of my freinds run 12 bolts in there metrics i think they are out of cheveles and are 1.5 inches longer on each side.

Dirt Full Roller

Total posts: 50
posted July 26, 2005 01:14 PM  
If you can find some old pontiac cars i think the early 70's leman's came with a bolt in or there was a BOP(buick, oldsmobile, and pontiac) rear that was bolt in also. Not sure on the gearing ratio but with aftermarket axles they are a heck of a rear end. If you find one out of a 2 door it should bolt right in with a little pushing on the upper arms. If you run the stock axles with these you will have to check them every 2 or 3 races the flanges on the ends are weak and you can see cracks manytimes before they break.

Dirt Forum Champ
Total posts: 5390
posted July 26, 2005 09:33 PM  
that chevelle 12 bolt will fit thats what alot of guys lubeguy and i run against are running

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