Looking for some help my sons SC6 junked another modified three gear gear box. I am looking to switch it over to a four gear mid motor like the one i am running. I can't find a four gear mid motor gear box on Amain. Anyone know what or where i need to be looking for one. If anyone has one built or bare case i would go that route if you wanted to sell one. We are really happy with how they handle our small indoor dirt track my son in making the A consistently as for me i still crash too much but its not the cars fault I'm too old and slow.