I did a bit of research for you, turns out the truck does not share parts with the cars and buggies so scratch what I said about the HPI 44T spur gear.... it's a smartech magic wheel clone truck.. it's a clone of a smartech but the parts are all the same.

Wether you broke in with 1 tank or 8 tanks the tranny would have stripped... these low end RC's are not suited for the demands of offroad. with these RC's gear mesh is critical because the parts are not as strong.. The mesh between the bell and spurs may not have been correct either.

you can get parts here since you are in NY. they do take paypal.
http://www.excelhobby.com/

your trucks parts are listed here just look up the gear you need
http://www.excelhobby.com/excel_hobby_039.htm