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Thread: 67 GTO Rear End Gear Ratio
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04-27-2019, 01:09 PM #1
- Join Date
- Apr 2019
- Location
- Grants Pass, OR
- Age
- 71
- Posts
- 1
67 GTO Rear End Gear Ratio
I’m restoring a 67 GTO, stock 3.55 rear end too low for highway use. Looking to rebuild rear end (add posi-carrier) and would appreciate a suggested ratio and corresponding tire/wheel sizing. 400 cu” engine getting tooled to about 425hsp. Want both acceleration and 70 mph comfort (not 4K rpm). Thank you, Bill in Oregon
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05-24-2019, 11:43 AM #2
- Join Date
- Sep 2010
- Location
- Bel Air, Maryland
- Posts
- 1,719
Silver- '02 Trans Am WS-6, 6M
SLP Air Lid/Smooth Bellows
L76 6.0L block, PRC Ported 243 heads, Texas Speed 224R cam.
Kooks Emissions LT Headers/Catted Y pipe
NGK TR55 plugs
Magnaflow Cat-back
Spohn Front Upper Tubular Control Arms
UMI Front Lower Tubular Control Arms
UMI Front Sway Bar
UMI Rear Lower Control Arms/ Adjustable Panhard Rod
UMI Welded-on Two Piece Subframe Connectors
Factory C5 Z06 17x9.5 wheels w/ 285-40-17 Continental Extreme Contact Sports all the way around.
Dyno Dynamics dynoed @:
415 rwhp
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