WS6 Rear End in a '95 Formula - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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Old 01-30-2010, 01:52 AM   #1
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Default WS6 Rear End in a '95 Formula

Hey guys! I need some help. I've got a 1995 Pontiac Firebird Formula. I just picked it up not too long ago and I discovered that this car has no Limited Slip and has drum brakes in the rear. Now we all know the drum brakes are great for burn outs...but for a performance boost you really wanna go with disc. So...I figured I'd kill two birds with one stone. I'm not sure if this question has been asked before and I promise I did attempt to search and came up with nothing.

But....
Can I install a complete rear end (axles and all) out a '98-'02 WS6 into my '95 formula, and how much of a royal pain is it going to be? Thanks in advance guys!
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Old 01-30-2010, 08:55 AM   #2
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Somebody already swapped that rear as all Formula's had 4 wheel discs. Drums were V6 cars.
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Old 01-30-2010, 09:01 AM   #3
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Somebody already swapped that rear as all Formula's had 4 wheel discs. Drums were V6 cars.


he's right.... looks like someone replaced your rear/housing.

and to answer your question, yes you can swap it out. just make sure the rear from the 98-02 comes from a car that does not have traction control.
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Old 01-30-2010, 01:52 PM   #4
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Oh wow...thats bull crap...thanks guys. That also explains why my e-brake cable has been cut, and why my sway bars look like tooth picks. Well can anyone tell me any more info about what a '95 firebird would have come with? Is it a limited slip rear end? Thanks again guys!
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Old 01-30-2010, 02:44 PM   #5
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Are you sure the car is a Formula ?
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Old 01-30-2010, 04:14 PM   #6
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Are you sure the car is a Formula ?
as per the vin...yes I am.
I knew the car had a "replaced" rear end...but I had no idea someone would even think to be as stupid as take that much time to down grade the rear like that.

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Old 01-30-2010, 07:39 PM   #7
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Stock rear was 4 wheel disc brakes and limited slip. If you have an M6, its a 3.42 gear. If A4, its either 2.73 or 3.23 gear.
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Old 01-31-2010, 10:26 AM   #8
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That info should come in handy...now I can use any of them right? Because I'm sure a 3.23 is going to be easier to find.
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Old 01-31-2010, 04:56 PM   #9
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Quote:
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as per the vin...yes I am.
I knew the car had a "replaced" rear end...but I had no idea someone would even think to be as stupid as take that much time to down grade the rear like that.
For the record 4th Gen Vin's don't distinguish between Formula and Trans Am. W66 (Formula) and Y82 (Trans Am) RPO's are the only sure fire way to identify the model.
The rear was obviously pirated for another car. And I would bet that you'll be able to find quite a few M6 cars 3.42 10 bolts available since most upgrade to 9" rears.
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Old 01-31-2010, 10:21 PM   #10
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For the record 4th Gen Vin's don't distinguish between Formula and Trans Am. W66 (Formula) and Y82 (Trans Am) RPO's are the only sure fire way to identify the model.
That's not what he said. He said he has a Formula, as opposed to a V6, which can be deciphered from the VIN by the engine code.

You can use any 93-97 LT1 rear end with no modifications. They all came with disc brakes and a posi (like said above).

You can also use a 98-02 LS1 rear, but you'll have to swap to the LS1 style e-brake cable. Since yours is already cut, that might be a better option for you (LS1's have a better e-brake setup, and bigger rear brakes).
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Old 01-31-2010, 10:28 PM   #11
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Yeah the car is definitely a formula the car is covered in stickers that say so ...and I did just find a rear end for it. I hope my flywheel comes in tomorrow so I can finally install my new clutch and finally drive the thing home! Thanks for all your help guys!

Last edited by TheKon; 01-31-2010 at 10:35 PM.
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