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Old 08-18-2008, 04:04 PM
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Cheapest Rear end Upgrade for G-Body GM

I have a 1985 Monte Carlo SS with the 10 Bolt 7.5" Rearend. I need something stronger such as 9" Ford or 12 Bolt GM, I would prefer to keep all GM. What would be the cheapest way to go for extra durability on a street car. Used or new, what have you guys out there done??

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Old 08-18-2008, 05:30 PM
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i have heard of guys using a 10bolt 8.5" from a earlier model Grandprix's like '77. the rear end is wider so you need to probably get different backspaced rims. drive shaft needs shortened and you have to drill out some holes bigger on the upper arms to bolt the rear end to so you get the correct pinion angle, the holes already there just farther back then the stock mounting location.
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Old 08-18-2008, 05:37 PM
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Quote:
Originally Posted by chevy_power427
I have a 1985 Monte Carlo SS with the 10 Bolt 7.5" Rearend. I need something stronger such as 9" Ford or 12 Bolt GM, I would prefer to keep all GM. What would be the cheapest way to go for extra durability on a street car. Used or new, what have you guys out there done??
I'm not sure which is cheapest. My guess would be the newer Ford 8.8" Mustang rear. They're cheap. Use Mustang adjustable upper control arms and the lower control arm mounts & arms + spring mounts from your 7.5" rear.
http://gbodyforum.com/viewtopic.php?p=17067#17067

http://www.cheperformance.com/cartge...st.asp?scat=71

Or 9" Ford>
http://www.quickperformance.com/Products/housings.htm
http://www.dcaracing.com/cat_9inrearend_1.html

Or Chevy 12 Bolt takes about the same mods as the Ford 8.8"

Or if you can find an 8.5" from a GrandNat , Olds 442/HO $$$
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Old 08-18-2008, 05:40 PM
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The Grand Nat & Olds 442/HO 8.5" is a bolt in no mods and almost as strong as a 12 Bolt. Only Diff. is ring gear is .375" smaller, pinion is same Dia.

Last edited by SSedan64; 08-18-2008 at 05:53 PM.
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Old 08-19-2008, 05:04 AM
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rear

The most economical way is to find a 8.5" grand national rear. They are a direct bolt in. The initial purchase price is on the high side for these rears, but until you do all the mods needed to make some other rear work your further ahead.

They did put a dana 44 under the "G" bodys that went to mexico. If you could find one of them that also would be a upgrade...But the 8.5" GN rear is the snizzle for you...


Keith
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Old 08-19-2008, 03:32 PM
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Called a place for a quick estimate, around 1600$~1800$ for a rear, used. Local speed shop sells a modified ( I believe ) 12 bolt rear that is supposed to bolt in for 2200$ Parts are new.
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Old 08-19-2008, 03:59 PM
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Quote:
Originally Posted by chevy_power427
Called a place for a quick estimate, around 1600$~1800$ for a rear, used. Local speed shop sells a modified ( I believe ) 12 bolt rear that is supposed to bolt in for 2200$ Parts are new.
Moser and Currie all have direct bolt ins for G Body cars. You might also want to look at "JustRearEnds.com" they have some really good pricing on their 12 Bolt and Ford 9 inch bolt ins for G Body cars.
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Old 08-19-2008, 06:51 PM
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Hit up Gbodyparts.com. Send them an email, seeing what they have for 8.5's. I know they used to even have them, complete drum to drum out of a GN, listed for 500.
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Old 08-20-2008, 06:21 AM
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Quote:
Originally Posted by SSedan64
The Grand Nat & Olds 442/HO 8.5" is a bolt in no mods and almost as strong as a 12 Bolt. Only Diff. is ring gear is .375" smaller, pinion is same Dia.
Good luck finding a "cheap" one, however.
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Old 08-20-2008, 08:10 AM
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Quote:
Originally Posted by joe_padavano
Good luck finding a "cheap" one, however.
Hi Joe, that's what I meant in post #3 by $$$. Should have put $$$$
Those things are like gold now. Anything to do with a GN is $$$$
BMM said $500?? More like $1500 or more now. The 8.8 Mustang rear is very cheap, just have to do your own welding for the lower control arm & spring mounts.
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