[bluefinger]

Try this one http://www.ring-pinion.com/RPMCalculator.html

Jason
Formerly Bluestangcom
"Got gas?"
Vintage Burgundy'66 Conv. 289 & C4. GT-ized
Strawberry/Silver '91GT
Rust/Red/Turquoise '67 coupe - Parting Out
Guards Red 2000 Porsche Boxster

http://www.bluestang.com

 

[Guest]

That's the one!

Drew*66
66 coupe, bench, 289 2v, dual exhaust, C4, A/C, Clearwater Aqua,

 

[sixtysevenGTconv]

Hi, This one also.
http://www.differentials.com/njfaq.htm

George