Is it possible to upgrade my 2.73 rear to a posi? or would it be cheaper to get a new posi rear end.. Thanks


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89 RS Camaro, LO3 305 TBI
Autometer Air/Fuel Ratio Guage
Cooling Fan Overide Switch
L69 Duel Snorkel Intake
Dynomax Ultra Flo SS Cat Back

 

I think it would be cheaper and better to get a new rear end. Your current rear end will have 26 spline axles, so expect to pay $300+ for a posi unit.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

 

You can get a PowerTrax unit to go in your open 26 spline carrier for about the same price or less than a new posi carrier. It will work as well as any clutch or cone type posi unit, and you can put it in yourself - no special tools needed.

The only down-side is it will click a little around corners. If that bothers you, it's a good excuse to upgrade your stereo.

Kevin's right, though, you should be able to find a whole rear that has posi and better gears for less money than you'd spend modifying your current rear.

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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 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, 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).

 

Thanks guys.. Could I get some recomendations of possi Diff makes.. I know there are probably quite a few that would work with my car.. also I want to keep my drum brakes.. Unless converting over to disk is not much hassle...
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I think I've found some leads in another post. Thanks Guys..
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89 RS Camaro, LO3 305 TBI
Autometer Air/Fuel Ratio Guage
Cooling Fan Overide Switch
L69 Duel Snorkel Intake
Dynomax Ultra Flo SS Cat Back


[This message has been edited by FastElectrics (edited September 14, 2001).]

 

hey fast_electrics, if I'm right, I think the rearend Ive got sitting in my garage is a 2.77 9-bolt posi that I think has the 26 spline axles.

sorry, that made it sound like I dont know what I have. I know its a 9-bolt posi with 2.77 gears, but I THINK it has 26 spline axles. if your interested, Im planning on selling the complete rear if you want it. it also has rebuilt disc brakes, red powdercoated axle housing, and new rotors.

[This message has been edited by TexasLT1 (edited September 15, 2001).]

 

All 9-bolts are 28 spline axles.

10-bolts were switched to 28 splines in 1990. Before that they were 26 spline.

Switching a drum brake rear end to disc brakes is more hassle and cost than its worth. Its much easier to just switch the whole rear end.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

 

Kevin91z, if I did the conversion that is basically what I'd probably do.. But are the brake lines any different, for use with disk?
is there any advantage with disk over drums on the rears.. also would a Auburn 10 bolt possi, fit in a 89 camaro rear end? I don't realyl know much about the inner mechanics on cars.. usually just enough to get by..

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89 RS Camaro, LO3 305 TBI
Autometer Air/Fuel Ratio Guage
Cooling Fan Overide Switch
L69 Duel Snorkel Intake
Dynomax Ultra Flo SS Cat Back