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Monte SS 1983-87 was the 8.5 optional ?

 
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Studebakerdude
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PostPosted: Mon Feb 12, 2007 9:26 pm    Post subject: Monte SS 1983-87 was the 8.5 optional ? Reply with quote

Does anyone know if the Monte SS came with a 8.5 as standard equipment or optional ?
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Studebakerdude
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PostPosted: Mon Feb 12, 2007 9:36 pm    Post subject: Reply with quote

sorry,8.5 rearend.
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cutlass389
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1978 Oldsmobile Cutlass

PostPosted: Mon Feb 12, 2007 9:40 pm    Post subject: 10 bolt Reply with quote

Nope, the 8.5" 10 bolt for the A & G bodies from '78-'87 was only available in Buick t-types, Grand Nationals, and 83-87 Hurst Cutlasses.
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Last edited by cutlass389 on Mon Feb 12, 2007 9:43 pm; edited 2 times in total
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Big Dave
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PostPosted: Mon Feb 12, 2007 9:40 pm    Post subject: Reply with quote

1964 through '71 the ten bolt had an 8.2" ring gear, with high performance, and heavy cars getting the 8.875" twelve bolt passenger rear end. Starting in 1972 through '76 all vehicles got the corporate 8.5" rear end. In '77 GM introduced the now infamous 7.5"-7.675" ten bolt rear ends in lighter cars, and the 8.5" ten bolt was reserved for heavier cars (pick-ups got the twelve bolt rear with big axle bearings but a punny pinion).

What is currently under your vehicle depends upon whether it was changed after leaving the factory or not, and how big a motor it had in it when it left the factory. I couldn't tell you if the Monte Carlo SS shipped with an 8.5" rear or not, but I doubt it unless it was one of the NASCAR styled sport coupes.


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Studebakerdude
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PostPosted: Mon Feb 12, 2007 9:55 pm    Post subject: Reply with quote

thx BigDave..that answers my question..I was told they came with 8.5, but wasnt sure. thx alot..
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Studebakerdude
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PostPosted: Mon Feb 12, 2007 10:37 pm    Post subject: Reply with quote

one more question.. can I tell if its a 8.5 or 7.5 , by the rearend cover measurement ? without looking inside ..Thx.
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Big Dave
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PostPosted: Tue Feb 13, 2007 6:44 pm    Post subject: Reply with quote

This site is one of the best for figuring what fits were and identifying what you got.

http://novaresource.org/axle.htm


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Craig_Morrison
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PostPosted: Tue Feb 13, 2007 9:54 pm    Post subject: Re: 10 bolt Reply with quote

cutlass389 wrote:
Nope, the 8.5" 10 bolt for the A & G bodies from '78-'87 was only available in Buick t-types, Grand Nationals, and 83-87 Hurst Cutlasses.

cant forget the 442's!!! Very Happy

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beersngars
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PostPosted: Tue Feb 13, 2007 11:29 pm    Post subject: Reply with quote

Big Dave wrote:
This site is one of the best for figuring what fits were and identifying what you got.

http://novaresource.org/axle.htm


Big Dave



Great site!!
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cutlass389
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1978 Oldsmobile Cutlass

PostPosted: Wed Feb 14, 2007 8:57 am    Post subject: Re: 10 bolt Reply with quote

Embarassed Thanks Craig. Evidently the 8.5" was available in the '84 Hurst Olds Cutlass and '85-'87 442's. Visual ID by looking at the cover in the 4:30 & 7:30 positions. Protrusions on the housing will be triangular on the 8.5" and little "fangs" on the 7.5".
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Studebakerdude
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PostPosted: Wed Feb 14, 2007 9:52 pm    Post subject: Reply with quote

Thx alot guys. I gotta go look at the 8.5 ??, this weekend..It'll work perfect in the Stude pee-cup truck....kinda feeling guilty about using it for that though, when somebody might need it for a real GN...later.thx again.
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cutlass389
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1978 Oldsmobile Cutlass

PostPosted: Thu Feb 15, 2007 9:51 pm    Post subject: Reply with quote

First off, doesn't your truck have leaf springs in the rear? The Monte rear uses a four-link and coil spring arrangement. This would take a considerable amount of fabrication to make work IF it was even worthwhile. Secondly, unless someone has changed it out, all Monte Carlos from '78-87 came with the 7.5" axle which would be inadequate in a real steel truck. My axle came out of an '86 SS and is a 7.5".
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Nate81camaro
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PostPosted: Fri Feb 16, 2007 9:52 pm    Post subject: Reply with quote

^^Yep. You most likely have a 7.5" 10 bolt...unless someone changed it out.

I take it you need a 10 bolt that is as wide as the one out of a monte carlo?? If not, look at the 2gen (70-81) camaros. They had the 8.5" 10 bolt your looking for...guess how I know.
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Studebakerdude
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PostPosted: Wed Feb 21, 2007 10:29 pm    Post subject: Reply with quote

well...thats why I asked about the GN..thats the rearend I was looking to buy, but before i made a 2 hour trip to look at it, I asked a few more questions and he finally admitted it wasn't a GN..as far as installing a 4 link in to a leaf spring truck,,,it will be a gravy run compared to the work it took me to put the Grand Prix suspension clip on the all steel truck. I have done major modifications to the truck, such as setting the drivetrain back about 20 %,, as I'm trying to dip into the low 11's....I have come to the grissly realization that I will use a 9 inch and get it over with...it'll cause me grief down the road i'm sure, if I go any othe r route...thanks again guys , for ur input. awesome site for info..take care. ....
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