This one is good, specially if you know your trans gear ratios.
Tire height can be found in mfg's specs....or just put the tire size in.
I'm going to tweak the code from that site for ford trans and put it on my own site...and maybe integrate it to evolution if brent wants to. So, bookmark that one if you want, otherwise I'll be back with the new address once I get it all updated.
"When I know more, I'll be forthcoming. Or I won't be forthcoming, and I'll be honestly deceptive." - Les Miles