Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Another 9 bolt ?

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Old Aug 7, 2005 | 09:28 PM
  #1  
SGT.ROCK's Avatar
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From: Waynesville,Ohio
Car: 1989 Trans Am
Engine: 350 TPI
Transmission: 700R
Axle/Gears: 9 bolt 2.77
Another 9 bolt ?

If my car has the 2.77 gear am I stuck with that?, or does someone make a 3.73 gear for my carrier.
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Old Aug 7, 2005 | 09:48 PM
  #2  
Klortho's Avatar
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From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
I'm wanting to think that you can only put a 3.73 in a carrier that originally had at least the 3.27 in the 9 bolt.
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Old Aug 7, 2005 | 09:54 PM
  #3  
NastyL98_T/A's Avatar
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From: Severn, MD.
Car: '88 T/A and '90 T/A
Engine: LB9/383
Transmission: T5/700R4
You'd have to upgrate to a 3 series carrier as stated above. Meaning a carrier from a rear that had/has 3.27 or numerically higher gear ratio.
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Old Aug 7, 2005 | 10:03 PM
  #4  
SGT.ROCK's Avatar
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From: Waynesville,Ohio
Car: 1989 Trans Am
Engine: 350 TPI
Transmission: 700R
Axle/Gears: 9 bolt 2.77
So anyone that wants to upgrade there rear and has a 2.77 carrier is SOL?
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Old Aug 8, 2005 | 05:40 AM
  #5  
Fastrnu's Avatar
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From: In front of my TV.
Car: 92 RS
Engine: H/C/I/E LS1
Transmission: T-56
Axle/Gears: 4.10
Maybe not SOL. I'm waiting on some replies in another post to make sure the info I have is correct but you can get new parts from AUS. The diff is a newer design but should work, based on info I currently have. I don't feel the price is too terrible either.
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Old Aug 8, 2005 | 06:56 AM
  #6  
Cruz'N Bruz'R's Avatar
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From: Cincinnati, OH
Car: 87 Iroc Z
Engine: 383ci.
Transmission: WC-T5
www.9bolt.com

check them out, i'm pretty sure he told me the 9-bolt carriers were large enough to fit all sizes from 2.77 to 4.10+
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Old Aug 8, 2005 | 11:22 AM
  #7  
NastyL98_T/A's Avatar
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From: Severn, MD.
Car: '88 T/A and '90 T/A
Engine: LB9/383
Transmission: T5/700R4
Originally posted by SGT.ROCK
So anyone that wants to upgrade there rear and has a 2.77 carrier is SOL?
Not SOL, just need a carrier. Shouldn't be too hard to find one. If you put a 10 bolt 2 series and 3 series carrier side by side you'll see the difference. It's kinda hard to describe in words, but it's got to do with the spacing of the ring gear (side to side) to mesh properly with the larger diameter pinion.
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Old Aug 8, 2005 | 12:03 PM
  #8  
88 350 tpi formula's Avatar
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From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
Originally posted by Cruz'N Bruz'R
www.9bolt.com

check them out, i'm pretty sure he told me the 9-bolt carriers were large enough to fit all sizes from 2.77 to 4.10+


the housing is


the carrier whould need a spacer ring or a thicker ring gear(which is not made to my knowledge)

I had some pictures of both series carriers next to each other but are wonderful search eng. can't find that post



now you could have the spacer made but, the carrier is not that hard to come by
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