Here is a listing of the various top speeds for the different transmissions and rear ends.
Automatic tranny, stock size tire (225/50/16):
3.73 rear @ 7000 rpm 4th gear = 199 mph
3.91 rear @ 7000 rpm 4th gear = 189 mph
4.30 rear @ 7000 rpm 4th gear = 172 mph
Automatic tranny, common upgrade size (255/45/17)
3.73 rear @ 7000 rpm 4th gear = 207 mph
3.91 rear @ 7000 rpm 4th gear = 198 mph
4.30 rear @ 7000 rpm 4th gear = 180 mph
Manual tranny (turbo), stock size tires
3.73 rear @ 7000 rpm 5th gear = 185 mph
3.91 rear @ 7000 rpm 5th gear = 176 mph
4.30 rear @ 7000 rpm 5th gear = 161 mph
Manual tranny (turbo), upgraded size tires
3.73 rear @ 7000 rpm 5th gear = 194 mph
3.91 rear @ 7000 rpm 5th gear = 185 mph
4.30 rear @ 7000 rpm 5th gear = 168 mph
Shits n Giggles calc
auto tranny with 245/65/18 (yes, these fit just fine)
3.73 rear @ 7000 rpm 4th gear = 243 mph
