My brother just purchased a used Nitro 4-tec and as he has no nitro experience he asked me to give it a once over. I am not sure what model it is but it does have a 3.3 and an AM radio. I got the engine started and tuned so that it starts and stays running. Now here is the problem no matter how much throttle I give it is does not move. I removed the clutch bell to inspect the shoes and spring and they seem in fine condition. The drive pin on the large 2 speed gear is still intact. I am not very familiar with this transmission as I am the owner of many t-maxx trucks and never a 4-tec and it seems a little more complicated. Any help or suggestions is greatly appreciated thank you.