Dear Coldcomfort,
It all about combination. We potentially are quickly going to go down worm hole that's about to cause you great confusion (at least it did me when I was at your stage). If you want a summary, take home message its this:
Quote:
Originally Posted by Gaz64
Yes, a 6 speed does help for cars with low rear gears. 3.7s and up,  |
There is no right and wrong here in terms of gearbox. Gaz64 pretty much nailed it here. Both Tko600 and T56 can be made to work, It all about the combination, ie: Engine power band range (where's the torque), Rear end ratio.
One of the main benefits of the 6-spd is the ability to gear cars to manage fuel consumption ratings. That's often why you see more and more gears in newer cars. Potentially NOT and issue in a cobra.
For the record: I have TKO600 box with 0.82 5th gear, 3.42 rear ratio, and a very flat torque curve, that comes on fairly early. Its bang on for me. No regrets.