I have a 96 Softail refitted with a 107" S&S motor, Shorty E carb, IST ignition and a Rev Tech 6 speed tranny. While driving in 6th gear around 63 to 70+mph it feels like the rear brake is being depressed and then let off or something is binding then frees itself. Its an odd feeling but that describes the way it feels best. I have also found in 5th is does the same thing around 50 mph but not as noticeably. Any one ever have anything like this happen to them? I have about 1200 miles on this thing and just don't trust it for any long trips because of this problem.