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

from 2.73 OTF to 3.73 POSI...what do I need?

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Old Feb 12, 2006 | 07:29 AM
  #1  
ThraxXx's Avatar
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Joined: Dec 2003
Posts: 758
Likes: 1
From: Ontario, Canada
Car: 1988 Pontiac Trans Am
Engine: 5.0L Fuel Injection
Transmission: Automatic 4speed /w OVerdrive
from 2.73 OTF to 3.73 POSI...what do I need?

Like the subject says. I am rebuilding my rearend from a 2.73 PegLeg (One Tire fire), to a 3.73 POSI unit. I already got an Auburn POSI for my rear end on its way. I know I am gonna need gears. Any other items that I am gonna need before I can go to my mechanic and say "LOAD IT UP!". Sure I could ask him but I would like to get all the stuff and have it ready without bugging him until install day.

Last edited by ThraxXx; Feb 12, 2006 at 07:33 AM.
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Old Feb 12, 2006 | 10:21 AM
  #2  
DJP87Z28's Avatar
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Joined: Mar 2003
Posts: 4,771
Likes: 15
From: Florida
Car: 1987 Black IROC-Z (SOLD)
1) Auburn Limited Slip is a 3-series.
2) it will accept 26 spline axle shafts (1988 model had them).
3) 3:73 Gears for the carrier.
4) Rebuild kit
5) money

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