[fionn]

4.1's would be a bit too much for our cars IMO, 3.23 or 3.55's would be great. I'm sure they will be out soon. GSM was planning on releasing them a while back before diablo but could not get it done. If you just wanted to drag race your car 4.1's would be pretty good with drag radials, you could cross the 1/4 mile marker at over 5000 rpm's in 4th so drivability would be crap but you would get good use out of 4th at the track rather than just shifting into 4 right before the 1/4 mile.
as soon as the challenger comes out there might be the option of using the rear gears and or the 6 speed manual transmission from them. If I remember correctly they have 3.9's in the 6 speed manual, I forget what they are using with the auto transmission.