Ok, I have a 2000 GT automatic and I put some 4.10 gears in. At the same time, my speedo and thus odometer were thrown way off, so I had to put a custom chip in also. 4.10's are about as steep as I would recommend for a daily driver. My gas mileage took a hit, and I cruise on the freeway at damn near 3000rpm. They sure make everyday city driving fun, though! My real mods are:
Bassani X-pipe, Magnaflow After-cat, C&L CAI/ 80mm MAF, Mac 70mm Throttle Body, Steeda Underdrive Pulleys, Ford Motorsport 4.10 Gears, Custom Tuned Autologic Chip. Steeda Sport Springs, Caster Camber Plates, Subframe Connectors, Strut Tower Brace.
The Bassani pipe was my favorite mod. Check my other thread out in this forum called "my overall mod evaluation." It'll give you a better idea of how each bolt on will affect your ride, since we have the same car.
If I had some sticky tires and control arms, I'd be running mid-low 13's.
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