What year is your car? If it's a '96-'98 then 3.73s could be ok because they don't have as high of a powerband as the '99+. If it's a '99+, then it's like Blake said, 4.10s for a manual or 4.30s for an auto (some people are happy with 3.90s but I like my 4.10s).
But one thing is for sure - 3.55s are a waste of time.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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