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87 firebird with posi?

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Old 06-01-2004, 06:31 PM   #1
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87 firebird with posi?

my supervisor's husband at work has a 87 v6 firebird, its been wrapped around a truck, and sitting in his yard for about 3 years now. whats the chances this v6 firebird had posi? cuz if so, i know they will just let me strip it form the car. it sure as hell would beat me 3.08 posi. but i only would want this new rearend if its posi as well.

whats the chances? i cant call them yet cuz they still at work.
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Old 06-01-2004, 06:49 PM   #2
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It probably has 3.42 gears.

The likelihood of it being posi is very slim. However, it is possible.

It should be worth it for the gears alone. But, it would also be 26 spline.

Whatever...
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Old 06-01-2004, 07:58 PM   #3
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oh ya i forgot about the spine difference.

would this be worth a swap then if it was posi?
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Old 06-01-2004, 08:13 PM   #4
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Your '89 may be 26-spline as well.

I'd take the whole rear if possible. Swap it all in. If it isn't posi, get a PowerTrax for it.
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Old 06-01-2004, 08:30 PM   #5
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i know my rear is 28spline.

how much does a powertrax run? i never heard of this?
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Old 06-01-2004, 08:40 PM   #6
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Car: 82 Z28
Engine: Al LT1 headed LG4 305
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Axle/Gears: 3.73 posi with spacer


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Old 06-01-2004, 08:56 PM   #7
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Not likely a posi on a V6 car. But it is a option.
Open the center console and look at the option codes.
Find G80 for limited slip axle and GU4 for 3.23 and GU5 for 3.42. most likely 3.42:1. If it is a posi you'll probabily want to ****** the axles too. '87= 26 spline. your '89 likely 28 spline.
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Old 06-01-2004, 09:20 PM   #8
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Why not just get the whole rear?

If it's open, get a PowerTrax for 28-spline, put it along with your axles in the '87 rear, now you've got a 3.42 "posi" with 28-spline axles.
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Old 06-01-2004, 10:25 PM   #9
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how much would this run me ?i got to talk to the guy, its confirmed not posi.

keep in mind my current rearend is already posi. would it be cheaper to just buy gears for my current rearend?

also, he said the 5speed in it is great shape.

is their any market for t-5's that were attached to a v6?
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Old 06-02-2004, 12:39 AM   #10
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Car: 84 Z-28 Camaro
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Axle/Gears: richmond 3.73, eaton posi


If it bolts up (I don't see why it woulden't) I'll take it, mine's about to blow up
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Old 06-02-2004, 12:42 AM   #11
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Axle/Gears: 3.73 posi with spacer


The V6 t-5 are junk way worse then the v8 ones. Also they do not bolt up, you have to change the bellhousing to the v8 pattern.
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Old 06-02-2004, 12:45 AM   #12
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oh well, I guess I'll keep saving for that T56, I have about $1,000 saved now the web siter I was looking at wants ~$2000 for one.
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Old 06-02-2004, 04:33 PM   #13
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You have 3.08 posi, 28-spline.

The other car has 3.42 open, 26 spline.

The 3.42's won't fit your 2-series posi carrier. I suppose you could go with a ring gear spacer. You'd have to have a shop set the gears up (this isn't something you want to try without the proper equipment, which typically costs more than the set-up labor). Probably cost you in the neighborhood of $275-$400 total.

Putting the other rear in with a PowerTrax and your axles would cost you about $325 for the PowerTrax plus whatever he wants for the rear (probably not worth more than $75-$100).

Might as well have a shop install 3.42 gears for 2-series carrier in your current rear. Probably run in the neighborhood of $300-$450 total.
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Old 06-02-2004, 05:48 PM   #14
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or couldnt i just buy high gears for my rear end and have them installed?

http://store.summitracing.com/partde...=RMG%2D4900071

3.73 for a 2-series 28 spline.
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Old 06-02-2004, 06:51 PM   #15
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That's the concept.

I thought/assumed 3.42's were what you wanted.
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Old 06-02-2004, 08:02 PM   #16
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well i would really take anything, just 3.42 were on the car and better then what i currently have.
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Old 06-04-2004, 07:00 PM   #17
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Car: 1986 Special Edition
Engine: 2.8/ECM/Int/Exh
Transmission: T5
Axle/Gears: 3.42 posi


Quote:
Originally posted by ME Leigh
I don't think V6 cars came with posi.
I have an '86 Special Edition with the 2.8L, T5 and posi. I think they are rare though...
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