Reese, welcome to the forum!
Is your 91 coupe an SSP? If so, do you know it's history?
Regarding gear choice, it depends upon your intended use. Will it strictly be a 1/4 mile racer, or will it have split duties on the street as well. What engine mods do you have and how much HP is it making? If you're looking for 1/4 mile performance, you'll also want to take into consideration the rear tire diameter and how it determines the final effective gear ratio. A taller tire (or drag radial) will reduce the numeric value of your gears. Dont' underestimate this - my taller rear 255/60R15 BFG's would reduce 3.73:1 gears to 3.59:1 gearing.
Once you know your final effective gear ratio for a given diameter rear tire, then you can look at your axle choices to optimize your top non-overdrive transmission gear for maxing out while hitting the traps.
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Bill Jr.
To everyone out there, wherever you are. Remember, the light at the end of the tunnel may be the police chasing you down in their own Mustang!
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