4th gen width
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Joined: Jan 2001
Posts: 213
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From: Cincinnati, Ohio
Car: 87 GTA
Engine: Eaton Supercharged 350 TPI
Transmission: 700r4
4th gen width
I am considering swapping a 4th gen rear axle into my 92 firebird but am getting conflicting numbers on the width difference. Some say it is 1" per side, some say 2" per side, and finnaly some say 1.5" per side. Is there anyone out there who knows what the exact difference is? Thanks for you help.
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Joined: Mar 2001
Posts: 2,047
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From: The State of Hockey
Car: 1987 Trans Am GTA
Engine: Miniram'd 383, 24X LS1 PCM
Transmission: TH700R4, 4200 stall
Axle/Gears: 9", 4.33:1
The 4th gen rear axle assembly is exactly 3 inches wider, overall, from axle flange to axle flange, than a 3rd gen axle. So that comes down to making the wheels extend out 1.5 inches farther on each side. I know, I have a 4th gen rear in my GTA and I measured both axles during the swap 
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1987 GTA L98 MD8
355, TFS Heads, LT4 Hot Cam
My GTA
The Minnesota F-body Club
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1987 GTA L98 MD8
355, TFS Heads, LT4 Hot Cam
My GTA
The Minnesota F-body Club
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