kkingsrulee

my 1990 rs doesn't have a positraction rear end correct?

it's stock

tony_cogliandro

iTrader: (3)

yes you are correct, it doesn't.

terrytunes

Ive been reading quotes for an hour, The answer is my 98 camaro v6 automatic has limited slip posi that came with the car from gm! The v6 and v8 rearends are the same, 98-02 the gears can be different.

big gear head

The G80 limited slip differential could be ordered, but was not standard.

Formula 305

V6 and V8 rear ends are not all the same, both could be ordered with Posi, but there are a lot of other parts in there that could vary between cars.

Also 98 is obviously a 4th gen, and available equipment was different than the 3rd gens so I'm not really sure how the fact your Camaro has Posi is even relevant.

Night rider327

iTrader: (13)

All GM third gen F body rear ends are the same no matter if it had a 4, 6 or 8 cylinder engine. The only diff was the gear ratio installed in the rear end. The 4 and 6 cyl. cars norm. had a lower gear.. Also stick shift cars norm. had a lower gear than auto trans cars. Then of course you had the option of posi on them and the std. posi installed in a few.

The only changes to the 10 bolt rear was wide spread in the 3rd gens and that was the swap from 7.5" to 7-5/8" ring gear and the swap from 26 to 28 spine axles.

The V6 cars got those same "upgrades" at the same time as the V8 cars.

Formula 305

The are not all the same, gear ratios available varied depending on motor and trans, disk and drum brake rear ends got different flanges for the brakes, ect ect. Idk about you but in my mind the rear end is the whole assembly, which for the most part is unique to each car. Lumping them all together is kind of ignorant. My old rear end and my new rear end, while both being 10-bolts from 3rd gens, are far from the same.

big gear head

I think what night rider is trying to say is that they were all the same basic 7.5 10 bolt (except the '85 to '89 Borg Warner 9 bolt). Where a '70 Chevelle would have got the 8.2 10 bolt for everything with less than 300 HP it would have got the 12 bolt for all of the high performance engines. That was not the case with the 3rd gen F bodies (except for the 9 bolt). A '84 Z28 didn't get a larger rear end than the '84 V6 car.

gt4373

If You Don't See A G80 RPO Code In Your Service Parts Identification Sticker,You Don't Have It.

Night rider327

iTrader: (13)

That is correct. That's what I was pointing out.

To me the rear end is the housing, ring and pinion, axles..

The 6cyl and the 8cyl got the same basic rear end.

The disc brakes is an option IMO and not part of the "rear end"

I would also like to add that the gear ratios varied just as much between the V8 models as it did between the 6cyl and 8cyl models.
Just using some of the model years I have owned..
'91 V8 had 2.73, 3.08, 3.23, 3.42
'91 V6 had 3.23 and 3.42.... Same ratios as available with V8

'88 V8 had 2.73, 3.08, 3.23 on the 10 bolt
'88 V6 only had 3.42

'84 V8 had 3.08, 3.23, 3.42. 3.73
'84 V6 had 3.23, 3.42
'84 4cyl had 3.42 and 3.73... Same ratios available for 4, 6 and 8 cyl engines

Then you mentioned the brakes. I would be interested in seeing production numbers but my guess is more V8 cars was built with drum brakes rather than stock disc brakes in the third gen F body run.

So I see NO difference between the V6 and V8 rear ends..
Same gear ratios available , same ring gear size, same axles, same housing, same brakes for most of the cars