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Old 06-01-2004, 06:31 PM   #1
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Engine: LS6 w/ Vortech supercharger @ 7psi
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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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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

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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Car: '02 Z06
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Transmission: T56
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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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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

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
Transmission: TH350
Axle/Gears: 3.73 posi with spacer

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I don't think V6 cars came with posi.




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Old 06-01-2004, 08:56 PM   #7
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Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction

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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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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

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
Engine: 383
Transmission: T-56
Axle/Gears: richmond 3.73, eaton posi

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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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84 Z-28 in the prosess of re-build:
383, steel crank, forged pistons 4 bolt block .040 over
comp cams nitrous XP 288HR
Adv dur 288/315
Dur@.050 236/248
LSA 113
valve lift .520/.540
"quiet" gear drive
polished and ported trick flow 23* heads
comp P/N 26918-16 beehive valve springs
steel full roller rockers
edelbrock pro-flow 1000 CFM EFI port mached to heads
Venom 36 lb injectors
edelbrock nitrous sys, 150 shot
hooker 2210 1 3/4 pri headers
powermaster starter
powermaster alternator, 160 amp
'97 T-56 transmission
centerforce dual friction clutch
pro 5.0 shifter
richmond 3.73 gears
eaton posi
spohn K-member
spohn "wonderbar"
spohn torque arm/crossmember
spohn lower control arms
spohn A-arms
spohn panhard bar
spohn subframe connectors
dual exauast, 3" up to cut outs
nordskog digital dashbord
trippel gauge pilar mount
digital fuel press.
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Old 06-02-2004, 12:42 AM   #11
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Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer

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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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LT1 headed LG4 305 beast! Comp Solid lifter XS-262-10S, 1.6 Roller Rockers, 10.2:1, Holley 4160 600cfm, modded Weiand 7502 intake to fit LT1 heads____ Custom cylinder head cooling. Weiand 8208 Short Water Pump____TH-350 3 series 3.73 with 2 series posi and spacer____ Hedman Hedders 1 5/8 headers and Y-pipe 3in Exhaust, Dynomax 3" Bullet muffler ____Moroso Ultra 40 Wires ACCEL HEI Super Coil ____Competition Engineering 3120 Bolt-on SFC's____Homemade: Wonderbar, solid tie rod sleeves, Aluminum LCA and Panhard Rod with spherical rod ends, alternator and PS bracket, Strut tower brace, and Decoupling torque arm with telescoping link.
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-FDR

"If this were a dictatorship, it'd be a heck of a lot easier, just so long as I'm the dictator."

-- President George W. Bush
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Old 06-02-2004, 12:45 AM   #12
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Location: Vilonia, AR
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Car: 84 Z-28 Camaro
Engine: 383
Transmission: T-56
Axle/Gears: richmond 3.73, eaton posi

Classifieds Rating: (0)

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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84 Z-28 in the prosess of re-build:
383, steel crank, forged pistons 4 bolt block .040 over
comp cams nitrous XP 288HR
Adv dur 288/315
Dur@.050 236/248
LSA 113
valve lift .520/.540
"quiet" gear drive
polished and ported trick flow 23* heads
comp P/N 26918-16 beehive valve springs
steel full roller rockers
edelbrock pro-flow 1000 CFM EFI port mached to heads
Venom 36 lb injectors
edelbrock nitrous sys, 150 shot
hooker 2210 1 3/4 pri headers
powermaster starter
powermaster alternator, 160 amp
'97 T-56 transmission
centerforce dual friction clutch
pro 5.0 shifter
richmond 3.73 gears
eaton posi
spohn K-member
spohn "wonderbar"
spohn torque arm/crossmember
spohn lower control arms
spohn A-arms
spohn panhard bar
spohn subframe connectors
dual exauast, 3" up to cut outs
nordskog digital dashbord
trippel gauge pilar mount
digital fuel press.
digital nitrous pressure gauge
digital oil temp gauge

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Old 06-02-2004, 04:33 PM   #13
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Join Date: Mar 2000
Location: Littleton, CO USA
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

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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Join Date: Sep 2003
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Car: '02 Z06
Engine: LS6 w/ Vortech supercharger @ 7psi
Transmission: T56
Axle/Gears: Stock IRS

Classifieds Rating: (2)

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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Join Date: Mar 2000
Location: Littleton, CO USA
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

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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Join Date: Sep 2003
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Car: '02 Z06
Engine: LS6 w/ Vortech supercharger @ 7psi
Transmission: T56
Axle/Gears: Stock IRS

Classifieds Rating: (2)

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

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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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Old 06-04-2004, 07:00 PM
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