I have an 85 iroc z and it does not have posi traction and i wanted to know if i can have an aftermarket system installed on my car and who sells these systems, how much one would cost, and would that give me much more traction. Thanks

 

Yes you can. See the Auburn link below. You will have to determine which carrier you have, a 2-series or 3-series. This is determined by the gears you have currently. You can get the differentials thru Jegs or Summit, or most any aftermarket supplier. I bought mine thru Internet racers Supply. You probably want to consider having it done by a pro, because it is a PITA to set up the gears.

 

It would be easier to fing a posi out of a thrid gen and have a rebuild kit ready for it. That way you wouldn't have to have your car wheel-less in the rear for quites so long. And you have a spare rear had you can be picky about the gears you have in it. If you have the Th-700-R4 you can go almost into the 4's for gears (I dont recomend it), but I don't know how tall the 5 speed goes.

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Colin Finkle
87 Sport Coupe Camaro, 5.0 L V8

 

so what years have posi and does a monte carlo rear end bolt on a third gen camaro(86)

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Steve
86 sport coupe
305 headers,cam ,intake,
15.8@89mph
2.73 rearend soon 3.73
400 small block soon

 

Steve. no the monte rear's wont bolt in. Plus they are not very strong when you get a good 350 infront of it. Ive blown 2 up so far in 2 different G-body's. Found a guy in Utah who can build a 9" that will bolt in for around 500 if I supply the rear.

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'87 Monte Carlo SS,with '89 IROC 350,700 trans, blew up 3.73 posi stuck with crappy 2.73's neeed gears! hooker headers, flowmaster 2 1/2" exhaust true dualls, recently installed a set of alum vette heads 58cc, new cam for a paxton, recently installed paxton, OMG need a posi bad. Found a guy who can build me a ford 9" (yep sorry guys) for less than 500 then comes all the goodies such as disk brakes so on and so on, will it ever end?? I hope not!!

 

is the rear end in a 87 a posi because if so Im going to find a wrecked 87 (3.45 gears) just for the borg warner to bolt in to my 86

does any one know if that will work

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Steve
86 sport coupe
305 headers,cam ,intake,
15.8@89mph
2.73 rearend soon 3.73
400 small block soon

 

Exactly what do you mean by "aftermarket system"?

If you like your gears and just want limited slip, a PowerTrax unit can be installed without removing the gears or carrier. About the same cost as a posi carrier (~$315), and since you can do it yourself, less to get running. Summit and Jegs sell them.

How much more traction you will have is almost impossible to answer. But, there should be a noticable improvement.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" cat-back, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

That is my rear end: The Posi 3.45. Great rearend, spinable/rainable. I dont know if posi-traction was an option, probably, actually no, it is an option. The Super Chevy 87 Z wasn't a posi and had gearing in the 2's. The 3.45 is a very torquey combo with the V8, and if going at 90-100 mph, and cruising at 70 mph, I wouldn't recomend going higher.



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Colin Finkle
87 Sport Coupe Camaro, 5.0 L V8

 

my gears are 3.42's i like those but i just want both wheels to spin instead of one so i can take off faster off the line where can i get more information on those powertrax systems.

 

I think the PowerTrax is actually a locker. Car Craft or Chevy High Perf. did an article on it, and they said it installed fairly easily without removing the gears, and drove very smoothly (none of the popping or banging like with normal lockers). I would like one on my '85.

 

Summit & Jegs carry them. I got mine from Summit. Get the 26-spline version.

It is a locker. It will click a little going around corners. If that bothers you, you've got a good excuse to upgrade your stereo. In many ways, it is superior to a "regular" posi.

 

how much did you pay for yours five7kid and what does the number of splines mean.

 

Thanks I think that is what I going to try and find. anyone know where a wrecked 87 iroc with posi is in washington for a good price

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Steve
86 sport coupe
305 headers,cam ,intake,
15.8@89mph
2.73 rearend soon 3.73
400 small block soon

 

Are you sure it's not a posi? (Well, actually "limited slip" since "Positraction" is the GM name for their own design.) My '85 had an Eaton Locker limited slip, which would allow the wheels to turn in opposite directions when up on jack stands and only engage the clutches when one started to spin 100 rpm faster than the other. The axle code stamped on the axle tube in '85 for an open 3.42 was 8JC or 8KA and it was 8PR for a posi. You can easily see if it's an open rear when you take the cover off. If it's open, then the Powertrax would be the quickest, cheapest and best solution.

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1985 Yellow IROC-Z 5.0 HO, T-5 3.73 Torsen, 4 wheel disks
PFCM pads, GTA wheels, Koni yellows, B&M Ripper, Dynomax

 

It was right around $315, but it was for the 8.2" 10 bolt in the '57, not the Camaro.

Until '88 or '89, 7.5" 10-bolts had 26 splines on the axles, which is what engages the carrier (or spider gears if open). After that, they had 28 splines on the axles.

 

thaks a lot guys i'm going to try to order one of those tomarrow.