The clutch bell for the the RS4 will work but it is aluminum. I would recommend a steel one from a NTC3
http://www2.towerhobbies.com/cgi-bin...4&P=0&C=CMGASC

Unless you have a really long straight away I wouldn't recommend that you jump from the stock 14/18 pinions to the 21/27 pinions. It will probably need to go at least 100 feet or more before it will shift into second gear and then it will need to go another 100 feet before it tops out in second. Providing that the engine can even pull the higher gears. These are probably real conservative estimates.
The CT4 and CT5's use the same pinions as the TR4 and go in excess of 70 mph.

I would recommend a 16/20 pinion or maybe a 18/22 pinion if you want more speed and still be able to run it around a track.


rolland