Quote:
Originally Posted by csx4017
I have a TKO600 with .83 5TH and 3.54 Differential. Pulls strong 50mph and up. About 2600 RPM at 70MPH. Cruising on Ca freeways a down shift to 4TH is not required often. For my driving style the .64 required more time in 4TH..........Thats my 2 cents........Note that the engine is a Roush 427SR.........Good luck
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Yep, it all depends on your state highway speeds (the real speeds, not the posted speeds). If you regulary road race over 130mph or so, then you don't want the .64 coupled with the 3.54 and 15" wheels. If you keep it under that, you never use fifth anyway. On the highway, if you like to cruise your Cobra in the 70s, then a 3.54/.64 combo is perfect. Your RPMs will be just over two grand, it's relatively quiet, and peaceful -- I love it. If your state insists you keep it around 60MPH, then opt for the .83 gear.