One more and I'm done - 3650 Analyzer
 

the formula for calculating the speed for the RPM's is this:

Apply it to any tire size, gear ratio, tranny ratio, and RPM:

TIRE = Tire size (calculate from previous post)
REAR = Rear Gear (ex. 3.73)
TRAN = Tranny Ratio (3.38, 2, 1.32, 1, 0.67)
RPM = Obvious

(60 x RPM) / (5280 / (TIRE x 3.1419/12)) / REAR / TRAN

A specific Example is:
TIRE = 25.68
REAR = 3.27
TRAN = 3.38
RPM = 2300


(60 x 2300) / (5280 / (25.68 x 3.1419 / 12)) / 3.27 / 3.38
15.9 MPH

If I am in error, I apologize, but I think this should work for us Tremec 3650 owners. I have put together an Excel Spreadsheet that calculates everything for you (you just plug in the tire numbers and rear gear). If you want a copy of it, let me know and I will get it out to you.

Jim