Quote:
Originally Posted by David Jones
With my TKO600 (.68OD), my GTO initially had a 3.55 rear gear. Cruising around my area (country 2 lane roads) I felt like I was either running more rpm in 4th than I liked or bumping around in 5th gear at lower rpm than I liked. I swapped the 3.55 8.2" for a 3.73 8.5" and it seems a better fit. Driving style and usage did make a difference for me.
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At 65 mph the 3.73 with .68 does 2090 rpms
At 65 mph the 3.31 with .81 does 2200 rpms
At 65 mph the 3.31 with .68 does 1855 rpms.
At 65 mph the 3.55 with .68 does 1990 rpms.
And it sounds like this is all with a very healthy 455 in your car.
With my setup and a .68 at 55 Im only turning 1570 rpms. I guess i could go try my current setup and cruise at 1500 and see if it likes it with no bucking or anything.
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86'
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