I forgot, which TKO do you have?
The 600 has a 2.87 first gear. That is why I picked it over the 500. Much better 1st gear for street use.
Most of the guys are running 3.25 to 3.55 rear ends. The few with 302s and 351s that run 3.73 turn high rpms on the hiway.
Right now I'm driving a 408 KC that will cruise below 2,000. 3550 (.68) 3.55 26" tires
found this in my files
http://www.corral.net/tech/drivetrain/gears.html