If you use an overdrive tranny you need to be aware that the overall final gear ratio will be pretty high unless you use a lower rearend gear ratio.

(Final ratio= rearend ratio X overdrive)

3.73 X 0.67= 2.50:1 final ratio
4.11 X 0.67= 2.75:1 final ratio

This will work to your advantage since the lower gear ratio will help acceleration while the overdrive will keep the cruise RPM low and help fuel mileage. I'd personally recommend the 4.11 rear gear since it will get the engine RPM more in the cams recommended cruise RPM.

Cruise RPM in overdrive at 70 MPH:
3.73, 26" diamater tire= 2261 RPM
4.11, 26" diameter tire= 2491 RPM.

There are better mufflers than Flowmasters. Walker Sonic Turbos work well and are much cheaper than the F'Masters. They also flowed about 40% better when tested by Jim Hand.

Ron




Last edited by Ron Golden; 06/18/09 01:44 AM.