X-factory sells the trans case and motor mount seperate but I had a spare from the x6 I run in buggy. It uses the same gears as the RC10GT/b4/t4 you just get another idler gear and idler shaft. The rest is just cobled together from junk I had laying around
It is great for people who have these old nitro trucks that no one runs anymore as they are real hard to sell since the class is dead. It is the best handleing truck I have ever had by far.