I strip a gear in the transmission so i replaced it and put it back together. The clutch bell on the motor was goin bad so i changed it. Now when the truck is in fowrard and u roll it backward the slipper clutch and gear on the clutch bell spin but not the motor so i feel the clutch bell is workin on the motor. But the transmission has a whine to it when u roll it. If you put it in revesre and push the truck foward the same thing happens. I'm new to all this but i dont remeber it doin this before. Any help will be greatly appreciated. :\