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Looking for posi rear...need help

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Old Feb 5, 2013 | 08:14 PM
  #1  
doxjoker's Avatar
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From: PA
Car: 1986 IROC Z
Engine: 350 TPI
Transmission: 5 speed
Looking for posi rear...need help

I have an 86 iroc z and am looking for a new rear, since I have a bent axle. I was told that it was a better idea overall just to get a whole new rear instead of just an axle.

I need some advice on what I should get in terms of size, what will fit my car, and best on price
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Old Feb 5, 2013 | 08:23 PM
  #2  
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Re: Looking for posi rear...need help

Only rears that will work, are ones out of 82-2002 Camaro or Firebird.
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Old Feb 5, 2013 | 08:27 PM
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Re: Looking for posi rear...need help

Yea, the '82 to '92 F body rear ends are a bolt in with no modifications. The '93 to '02 F body rear ends are a bolt in, but they are about 4 inches wider. The '98 to '02 rear ends have the best limited slip differential. No other rear ends will fit without major modifications.
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Old Feb 5, 2013 | 08:28 PM
  #4  
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Car: 1986 IROC Z
Engine: 350 TPI
Transmission: 5 speed
Re: Looking for posi rear...need help

Originally Posted by sofakingdom
Only rears that will work, are ones out of 82-2002 Camaro or Firebird.

Really? So your saying this, 1995 firebird, rear i found on CL should fit

http://philadelphia.craigslist.org/pts/3554288185.html
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Old Feb 5, 2013 | 08:38 PM
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Re: Looking for posi rear...need help

Yes, but it will be about 4 inches wider. This could cause problems with your tires fitting under the car.
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Old Feb 5, 2013 | 08:39 PM
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Car: 91' Z28. 70' Dune Buggy
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Re: Looking for posi rear...need help

It should fit, BUT, all 4th gens rears are 4 inches wider, so expect your wheels to stick out 2" further than they currently do on each side. Many members here run 4th gen Fbody rear ends.

big gear head replied the moment I did...
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Old Feb 5, 2013 | 08:48 PM
  #7  
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From: PA
Car: 1986 IROC Z
Engine: 350 TPI
Transmission: 5 speed
Re: Looking for posi rear...need help

Sweet, so do you think that rear well be a good purchase on my part
(For the price and everything)
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Old Feb 5, 2013 | 09:05 PM
  #8  
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Re: Looking for posi rear...need help

It's going to have the Auburn differential in it, so it's a gamble. If the Auburn is worn out then it's scrap metal. It can't be rebuilt. That's why I said that the '98 to '02 is better. They have the Torsen differential.
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