tko-600... .082 or .064

[Slick61]

Originally Posted by maxum_101

ok this is a bit complicated... lets say i have a spf cobra with a 3.46 rear 17 inch tires and a roush 427r engine what would be a good 5th gear to have? i want to be able to drive hwy at a comfortable rpm and still be able to hammer it around town . anyone out there have this set up that can give their comments on this?

I'm running a KCR 427W in my Backdraft with 3.73 rear & the 0.82 overdrive. At first I wished it had the 0.64, but with my cam, it would be completely useless at anything below 80 mph.

2600-3000 rpm on the freeway is PERFECT for my engine... the engine sounds fantastic, is running in the sweet spot for the cam, it's not too loud, and I still have good, tractable power on-tap for quick maneuvers. 3000 rpm puts me right around 75 mph, with 80 mph coming at ~ 3200 rpm. It's great. Above that, the wind buffeting is too uncomfortable for long-distance cruising. I know several people with the 0.64 overdrive who practically never get to use 5th, as the engine lugs too badly. Believe me... 3000 rpm on the highway sounds FABULOUS! It's not as fatiguing as it would be around town. If you want mileage, slow it down to 65 mph... it's mostly aerodynamics (or lack thereof).

... and you can still hammer it around town...