RE: Non-engaging tranny
lmao, I follow ya. Have you called traxxas? They got the best customer support out of everyone. I'm sure they would be able to tell you what it is. I just say this as I have been tryin to help you remember the obvious stuff. I got a revo. I had a similar problem with a duratrax axis that I had. The mount had actually melted to the gear cuz of friction. then another time I gave it gas, no go, took the center diff apart, looked inside, closed it back up, worked for a while and quit again. I dunno man. Let us know what you find. Sorry couldn't be more help.