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					Originally Posted by Dwight  I have a TKO 600 with .64 and 3.55 rear gears, 255/50-16 tires (25.25"). I love it. Cruise at 70 - 2100 rpms. 50 at 1500, slower than that and I shift to 4th.  | 
	
 Exactly the same with me.  5th is 
only used for calm highway driving, but at 70MPH and 2000RPM the wind noise is actually louder than the pipes.  It is delightful; but a .64 OD is not for road racing, only pleasure cruising.