Hey Sky, the best way to tell what gears you have is to jack the rear of the car up, put a mark on the drive shaft and a mark on the tire, turn the tire 1 revolution and count how many times the drive shaft goes around. That is more accurate then the calculators. The smaller diameter tire will make the 3:73's act like a 4:10 gear, hate to burst your bubble. The gear ratio is based on a 26" tall tire I beleive.
Rick
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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98