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

4th gen axles

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Old Mar 14, 2006 | 04:13 AM
  #1  
chio987's Avatar
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From: pittsburgh, PA
Car: 84 Firebird Trans Am
Engine: 305 4bbl HO
Transmission: 700-R4, 3.73 rear
4th gen axles

I am getting a posi diff and i will need 28 spline (i have an 84 so they r 26) but i don't think 4th gen fit bcuz they r longer than 3rd gen....i couldn't remember so tell me if i'm wrong....what r our length axles?
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Old Mar 14, 2006 | 07:50 AM
  #2  
AlkyIROC's Avatar
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
82-92 axles are 30-3/8" long
93 - 97 axles are 32-1/8" long
98 and up are 32" long

The only 28 spline axles that will fit in a third gen housing are from a 90-92 third gen or aftermarket axles.
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