Anyone know if I have gears by speed vs. RPM?

[astronut1885]

Hey guys. I've always been impressed how quick my car feels, even compared to my old HCI'd 83. Anyway, it almost feels like it has gears. Anyway, If anyone can fill me in on my probable gear set, here's what I can tell you:
4th gear 3k rpm 70mph.
What gears am I running? if anyone has a good guess, I appreciate it. It's still too cold and wet here to go outside, jack her up, and spin the driveshaft and watch the wheels.

 

[Stan Weiss]

Really cannot tell for sure until you say what size tires you have on the car.
OK 245-45-17 tires 4th gear 70 MPH 3000 RPM = 3.27:1

 

[astronut1885]

Yeah, I have stock tires/wheels. The car is really peppy then for stock gearing.