Another easy way to figure is you can go to Tremec website with a computer or get the app (free) with a smartphone, you can put in your engine rpm, tire size for the height, select the transmission you have (it shows almost all types of manual transmissions to select from) and an axle ratio. It will give you the mph for any rpm you put into it. Can change any part of the formula and get everything else to adjust with it. For 2000 rpm, with a 215/50/17 tire which is 25.46 in tall and putting in a tremec TKO-500 trans which has a .68OD it shows with a 3.31 gear ratio in 5th gear is 67 MPH. If you change gear ratio to 3.55 it will put 5th gear at 63 MPH at 2000 rpm. It actually shows mph of each gear at that rpm if you wanted to know. No math needed it does it all for you...
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 1967 GTO, 467 roller motor, e heads ported, tremec T56 magnum 6 speed and
9" done. EZ EFI 2.0 with FAST dual sync distributor and separate nitrous system done. Track is at 4300 ft elevation. so far a best of 11.95@116. Suspension now getting dialed in...tubular front a arms with dual adjustable coil overs HR Parts n stuff rear bar and whole car lowered 3 inches..
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