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Old 12-15-2004, 11:55 AM
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Monte SS rear end question.

Hi. a friend told me that all Monte Carlo SS's from 81-87 came with a 3.42 posi or limited slip rear end. just wanted to know if its true or not because i need a rear end for my '84 bonneville. Thanks.

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Old 12-15-2004, 03:52 PM
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The Monte Carlo SS's that came with TH350 transmissions had 3.42 gears, they made those in 1983 and 84. Then the 1985-88 Monte Carlo SS's had a 200-4R and the gearing was changed to 3.73. All had posi units.


Oh and the Monte Carlo rears are not as wide as your Bonneville's.
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Old 12-15-2004, 04:40 PM
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Thanks Alot. right now i have a 2.56 geared '80 monte ls rear end under it. fits fine. the bonneville is a g-body style car like M&M Customs Malibu.
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Old 12-15-2004, 06:00 PM
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Sorry, I was thinking Pontiac Parisienne.
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Old 12-16-2004, 08:19 AM
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not all monte ss's came with Posi - it was an option. If you still have your option list on the inside trunk, it's 'G80'. My '86 Monte has the 3.73 rear (which was standard on all 1985+ SS cars), but no Posi.

http://www.montecarloss.com/SS_FAQ_3.html#11

Kevin
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Old 12-16-2004, 11:25 AM
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Thanks for the info Kevin, I thought it was standard on those cars.

I wonder if it was an option on the 442's and Grand Nationals?
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Old 12-17-2004, 10:07 AM
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My 87 had 373s but but no posi
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Old 08-16-2005, 05:02 PM
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My 86 has 3.73 no posi
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Old 08-16-2005, 07:37 PM
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Quote:
Originally Posted by Ghetto Jet
Thanks for the info Kevin, I thought it was standard on those cars.

I wonder if it was an option on the 442's and Grand Nationals?
Yes, it was an option. Still coded as G80 from GM. Completely different rears though (8.5" in the GNs and T-Types). 3.42 was the only gear available on the GNs. Good discussion and more info in this thread...

G-body rear axles

Last edited by SinistrV6; 08-16-2005 at 08:01 PM. Reason: typo
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Old 08-16-2005, 07:43 PM
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The GN's had the 8.5" 10 bolt as compared to the 7.5" 10 bolt that came in every other G-body. The 8.5" is a direct bolt in as long as it came from the style of car it is going in (B-body to B-body, G to G). I wish I could find any 8.5 in any G-body local. The diesels came with the 8.5" but were 2.56 geared. I have never seen a diesel G-body. seen a few B-bodies though. Also, the 8.5" has more parts available to it, like the posi/lockers and such that cannot be had for a 7.5".
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Old 08-18-2005, 05:53 AM
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I had my 7.5 rebuilt completely only cause ,I too could not get a hold of any G-body 8.5. I got an Eaton posi-carrier for 300$ brand new off e-bay, ordered new axles from Moser 250$ ,LPW aluminum cover w/bearing load adjustment 120$ ,and a new set of 3.73 richmond gears (jegs) $?All high performance bearings, and my shop charged 200$ to disassemble and re-assmemble the whole rear.I guess if you are just gonna cruise and do an occasinal hole shot, this is fine. If you are headed to the track to do some drag racin and hard launches(w/slicks)then you should search more for the 8.5 or you will be twisting some axles and other goodies. IMO.

Ant.
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