Melrich:
The new TKO transmissions come in 3 flavors. One for the TKO500 and two for the TKO600.
The 500 has the ratios:
3.27, 1.97, 1.34, 1.0, 0.68
The 600 has the ratios:
2.87, 1.89, 1.28, 1.0, 0.68
2.87, 1.89, 1.28, 1.0, 0.82
The 600 with the 0.82 5th gear ratio is referred to as the Road Race transmission.
The transmission’s performance, and the car’s, is going to be based on several factors in addition to the transmission. Engine output, rear end gearing and tire size will also factor in.
Theoretical values for the transmission, rear end and tire size can be determined by using any one of several available calculators. One of the easiest to use is located at
http://www.368s.com/tools_rpm.phtml This allows you to simply plug in the numbers for final drive ratio, transmission ratio, tire size and a couple of others and it will generate theoretical values for speed at rpm. These calculations can be really helpful in seeing what changes in any of the values will result in for comparative purposes. Remember though that these are theoretical values and the real world application will vary somewhat. Never the less, a good starting point.
Conventional views recommend a final 1st gear speed to rpm value of no more than 10 mph per 1000 rpm for a “fairly mild street engine”. It’s up to you to determine what a “fairly mild” engine is.
DonC