[MA] 3.73 Posi Unit and gears; complete

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Old Mar 11, 2012 | 11:23 AM
  #1  
mt91ta's Avatar
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From: Boston, MA
Car: 1991 Trans Am
Engine: Supercharged 383 stroker
Transmission: T56
Axle/Gears: 4:11, 12 Bolt
3.73 Posi Unit and gears; complete

I have a lightly used 3.73 ring and pinion set with an Auburn High Performance posi unit for sale that came out of 10 bolt. I had this in the car for a 3k miles. I then added a supercharger and decided to upgrade the read end to a 4.11 12 bolt. Has been sitting in my garage for about a year; came out of the car running without any issues. This is the stronger clutch style posi unit and complete gear setup. I will not split this up, will only sell as a complete unit. gears new are about $150; the posi is about $400. Asking $400 for the complete set up. I also have a bunch of pictures if you would like.
Part # for gear: GM-14092111-11-41-7 5/8
Part # for posi: 542040, High Performance Series, 3.23:1 & Up

Here is a link to the pictures:
http://photobucket.com/camaroposi

If you have any questions feel free to call (650)241-8963 Thanks, Mike
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Old Mar 12, 2012 | 04:32 PM
  #2  
mt91ta's Avatar
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From: Boston, MA
Car: 1991 Trans Am
Engine: Supercharged 383 stroker
Transmission: T56
Axle/Gears: 4:11, 12 Bolt
Re: 3.73 Posi Unit and gears; complete

Looking to sell these this week. If not going on eBay. Let me know, Mike
$400.00 or best offer.
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Old Mar 20, 2012 | 03:08 PM
  #3  
respawnformula's Avatar
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From: NY, NY
Car: 89 Firebird Formula-maui blue/gray
Engine: 305 TPI 5.0 - getting 383 TPI!
Transmission: 700r4
Axle/Gears: 2.73 POSI / need 3.73(ANYONE ??)
Re: 3.73 Posi Unit and gears; complete

im a tard when it comes to compatible gears / carriers. I have a ten bolt rear with stock 2.73 gears, will this set up work with mine?
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Old Mar 20, 2012 | 07:35 PM
  #4  
mackjar66's Avatar
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From: Lafayette, IN
Car: 1989 GTA
Engine: pending install 383 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: 3.73 Posi Unit and gears; complete

Originally Posted by mt91ta
Looking to sell these this week. If not going on eBay. Let me know, Mike
$400.00 or best offer.


Will u separate the two. I'm looking just for the gears
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Old Mar 22, 2012 | 07:47 PM
  #5  
mt91ta's Avatar
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From: Boston, MA
Car: 1991 Trans Am
Engine: Supercharged 383 stroker
Transmission: T56
Axle/Gears: 4:11, 12 Bolt
Re: 3.73 Posi Unit and gears; complete

Sorry for taking so long to get back to you. Yes this will work in you 10 bolt as its the gears and posi complete
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Old Mar 22, 2012 | 07:48 PM
  #6  
mt91ta's Avatar
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From: Boston, MA
Car: 1991 Trans Am
Engine: Supercharged 383 stroker
Transmission: T56
Axle/Gears: 4:11, 12 Bolt
Re: 3.73 Posi Unit and gears; complete

sure, i'll sell the gears for $400
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Old Apr 3, 2012 | 05:53 PM
  #7  
TUCK1975's Avatar
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From: Ashland,Ky
Car: 1992 firebird vert
Engine: 355 soon to be a 406
Transmission: 700r4 goin t5 then t56
Axle/Gears: 373 or 410
Re: 3.73 Posi Unit and gears; complete

how much for just the posi unit
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Old Apr 3, 2012 | 06:36 PM
  #8  
mt91ta's Avatar
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From: Boston, MA
Car: 1991 Trans Am
Engine: Supercharged 383 stroker
Transmission: T56
Axle/Gears: 4:11, 12 Bolt
Re: 3.73 Posi Unit and gears; complete

Not looking to split it up. So $400
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Old Apr 17, 2012 | 10:35 AM
  #9  
ademarti's Avatar
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Re: 3.73 Posi Unit and gears; complete

Whats the best price?
250 shipped???

https://www.thirdgen.org/forums/engi...burn-posi.html
This guy sold his for around $100 bucks.

Please let me know what you can do.

Thank You
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Old Apr 17, 2012 | 11:40 AM
  #10  
mt91ta's Avatar
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From: Boston, MA
Car: 1991 Trans Am
Engine: Supercharged 383 stroker
Transmission: T56
Axle/Gears: 4:11, 12 Bolt
Re: 3.73 Posi Unit and gears; complete

I'd do $250 + S/H
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Old Apr 17, 2012 | 06:37 PM
  #11  
ademarti's Avatar
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Re: 3.73 Posi Unit and gears; complete

sorry man, i would have said deal, but looking into it i need a 26spline, i have a 1982 Z28.
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Old Apr 30, 2012 | 12:59 AM
  #12  
Zach/90\irocZ's Avatar
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From: San Diego, California For Now
Car: 88 Formula, 90 Iroc RIP, 92 RS Sold
Engine: 305 to 350
Transmission: 700r4
Axle/Gears: 10 Bolt
Re: 3.73 Posi Unit and gears; complete

Still available
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Old Apr 30, 2012 | 10:49 AM
  #13  
mt91ta's Avatar
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From: Boston, MA
Car: 1991 Trans Am
Engine: Supercharged 383 stroker
Transmission: T56
Axle/Gears: 4:11, 12 Bolt
Re: 3.73 Posi Unit and gears; complete

yes it is
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Old Jul 19, 2012 | 02:02 PM
  #14  
S_Johnson's Avatar
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From: Charleston, SC
Car: 87 T/A
Engine: 400SBC Carb'd
Transmission: T56, Kevlar clutch
Axle/Gears: 3.73 Yukon Duragrip posi
Re: 3.73 Posi Unit and gears; complete

Hey, I know this is an older thread, but I didn't see a "sold" so...

Is the set still available?

(also, it's 28 spline, correct?)
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Old Jul 19, 2012 | 08:27 PM
  #15  
mt91ta's Avatar
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Joined: Jul 2011
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From: Boston, MA
Car: 1991 Trans Am
Engine: Supercharged 383 stroker
Transmission: T56
Axle/Gears: 4:11, 12 Bolt
Re: 3.73 Posi Unit and gears; complete

Yes it is, Mike
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