Brent when you had your .21 in your nitro tc did the tranny shift ok?? All last summer I was not sure about my tranny shifting right in my TC-3. I figured that the .28 was causing it to speed shift into second. But on a hunch I took apart the 2-speed tranny and discovered that the ball bearing in the 2nd speed hub was binding up and keeping the tranny from shifting out of 1st. THe last run of the season after I repaired this problem was very frighting the car got airborne.............the TC-3 was faster than before because it went into 2nd gear !! I almost lost it!! Never had a bearing bind up on me like that but after it was replaced dam that car is fast.