Hey what's up everyone. I have a 3.27 Borg Warner rearend on my 1988 GTA. Is that rear end only available with a 350 and 700R4 transmission?? Thanks

 

im not sure if chevy and pontica used the same rear ends in both cars, but my 1989 IROC-Z has a 350/700r4 with 2.77 gears.

hope this helps

John

 

Alright, so it seems that you have a Borg Warner rear end too. Were those ONLY available with the 350???

 

im not sure, check online for more info on that


WELCOME TO TGO

 

Thanks for the welcome. I did look it up and it seems that Borg Warners only came with 350's. Thing is my Borg Warner seems to be connected to a 305. From the info i read the block should be a 350. I'm confused.

 

Maybe you'll find something helpful here:

https://www.thirdgen.org/1988-pontiac-firebird

JamesC

 

That's not right. LOTS of 305 cars have them. It might be true for one particular model of car, or one particular year, or something like that; if so, I've never heard of it or seem it in cars around me, but I could be wrong; but it's certainly not a general and universal rule.

Your car has whatever motor it happens to have in it, regardless of whatever rear happens to be in it. My car is an 83, and I put a rear in it with PBR brakes on it (clearly, not available in 83); that doesn't tell what kind of engine I have in it at the moment.

Your motor is identified by its casting numbers. All the rest of that, is not very useful.

If you want to know what your engine is, post the casting number on the block. Conveniently located right out in the open in plain sight (NOT), on top of the bell housing flange on the driver's side. The last 3 digits (which are enough) can also usually be found on the side of the block somewhere.

Casting number do not lie. Well, almost never, anyway.

 

hate to sound like a **** but use your vin#

 

The VIN only tells you what was in the car when it left the factory, not what it may or may not have now.

 

True but it's a starting point for him.

Look at the 8th digit. If it's an "F" your car came with a 305. If it's an "8" your car came with a 350.

 

Alright, so then I'll go ahead and look up the casting number and see what I have. Thanks

 

I know a guy who bought his 82 Z28 new and ordered it with 4 wheel disc brakes. He still has it with very low mileage. It has the BW rear end. I believe the BW rear end was the rear disc option through 89 90ish. This is the history/restoration board, so what it came with from the factory "IS" the most important part of these threads, not what the car may or may not have now.

 

The 9 bolt wasn't available in 1982. The rear brakes also had nothing to do with which rear was used.

 

Do you have or do you know anyone that has an original '82 with the 4 wheel disc brake option? And the people with the 9 bolt would probably have to disagree with that.

 

True, but history documents that the Borg-Warner 9-bolt wasn't available until 1985. So something isn't kosher, or someone's simply mistaken. That top, center tenth bolt can be hard to notice sometimes--especially if it's missing, which might be the case.

 

The 9 bolt didn't make an appearance until 1985 in the Firebird, and later in the Camaro. It didn't exist in 1982. If he has the original rear, it's a 10 bolt. If it has a 9 bolt, it's not original.

People with 9 bolts would have to disagree with what? There are tens of thousands of 10 bolts with disc brakes. Ordering rear disc brakes didn't make the car get a 9 bolt.

 

Also check your SPID label for G92, which is the code for the performance axle ratio option(3.27 with an automatic).

These would be places to begin your search, and are most likely still accurate.

 

My 1983 T/A came with the rear disc brakes and the rear axle was the good old 7.5 10 bolt.
You need to update your incorrect info on Third gen rear axles.

Leon.

 

Trans Am GTA Technical Specifications

in '88 the 3.27 could come with the either the 305 (with auto or stick) or 350 (of course, auto only).

There wasn't a G92 code for the Pontiacs, it was supposedly a Chevy only code.