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What size is a monte ss rear end?

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patmckinneyracing
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What size is a monte ss rear end?

Postby patmckinneyracing on Mon Mar 22, 2010 2:04 am

I'm not gonna say who but I just got a message from a person who is claiming that a rear end out of an 86' monte ss is NOT a 7.625 measurement. Their claim is that the 7.625 rear end was only found in the later gen. camaros. Now I may be wrong but I want verification on this because I did my research a long time ago and am pretty sure the monte ss's did not get the regular 7.5 rear.
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Blake442
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Re: What size is a monte ss rear end?

Postby Blake442 on Mon Mar 22, 2010 2:11 am

They had both.

The 7.5 was in earlier cars ('83-'85?), and the later years got the not-much-better 7.625 ('86-'88 I think).
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84cutspreme
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Re: What size is a monte ss rear end?

Postby 84cutspreme on Mon Mar 22, 2010 2:14 am

Not 100% sure of years, but only came with 7.5" & 7.625", even the SS's

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patmckinneyracing
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Re: What size is a monte ss rear end?

Postby patmckinneyracing on Mon Mar 22, 2010 2:23 am

Thanks guys I just wanted to confirm my knowledge on this. I just read the same thing over on the monte carlo ss forum that 83-84 was the 7.5 then the 7.625 was made in 85' and up.

So to the wise a** who sent me this message, and you know who you are:

patmckinneyracing wrote:Only chevy and my first car is my 1980 malibu classic with a sbc 350 with a soon to be mated 700r4 and a 7.625 3.73 rear end out of a 86' monte ss. My second car is my 71' Roadrunner and don't knock mopar till you tried it. I've considered putting a 440 mopar under my malibu's hood and I'm just crazy enough to do it. :twisted: :shock: Third and last car I own right now is my 96' dodge dakota that was an original air force truck and just turned 53k miles. :mrgreen:




FYI 7.625 rears are from late model F body cars (93+) Monte SS is 7.5 as per usuial in G body land.


Might want to double check your facts. I know this isn't a big deal for most of us who consider the 7.625 a 7.5 rear that is only a fraction larger, but if your gonna try and correct me on what rear end I know I have in my car, you better have your facts straight. Nothing like making yourself look like an idiot.
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85 Cutlass Brougham
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Re: What size is a monte ss rear end?

Postby 85 Cutlass Brougham on Mon Mar 22, 2010 3:24 am

Attacking this logically, the likely reason GM went to a 1/8 in larger ring gear was the tooth engagement on the numerically higher ratio (3.73) used in cars with the Th 200 4R. You see, as you go to a numerically higher ratio, the pinion gear becomes smaller in diameter and has less and less engagement with the ring gear. Now, the early SS cars (at least the 83's) that came with the Th 350 used a 3.42 gear ratio which would have had a larger pinion than the 3.73. So, they probably switched when they went to the overdrive transmission, which I believe was in 1985.
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Re: What size is a monte ss rear end?

Postby Donutboy97 on Mon Mar 22, 2010 4:21 pm

Q: What were the trans/rear combinations for the SS's (83-88) ?
A: 1983-84: TH-350 with 3.42's / 1985-88: TH-200R4 with 3.73's (the SS had a 7.625" rear). With the TH350 being 1:1 in 3rd gear, the final ratio was 3.42:1. With the TH-200R4 having a 0.67:1 4th gear, the final ratio was 2.50:1. There is more trans ratio information elsewhere on this site.
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80Maliboo
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Re: What size is a monte ss rear end?

Postby 80Maliboo on Mon Mar 22, 2010 8:09 pm

Maybe you should put your money where your mouth is and measure the gear?

Im sure that would satisfy the unnamed asailant.
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