bark3rd, the difference is he is in a Cobra, you have a GT.
I had 3.73's in my 96GT
I have 4.10's in my 97 Cobra. I'll be changing to 4.56's this summer. Here is a link to an RPM/Speed/Gear calculator.
http://www.corral.net/tech/gearcalc.html
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T-Bones 1997 Cobra
Wht/blk, Pro 5.0,FRPP 4.10's, aluminum driveshaft, FRPP throttle body, C&L 80mm MAF, K&N, Steeda U/D pulleys, Steeda timing adjuster, Flowmasters, s/f connectors, FRPP pro springs, BBK caster/cambers.