wanting to bomb proof my brushless racing emaxx

Hey guys need some help!!! I have a CF chasis fastlane arms, limited engineering shocks, a fiegao 9xl and mamba max esc. Problem is i keep on stipping my gears! Ive already upgraded my idler gear to rrp. My gear ratio is 66/21. I have stripped my gear three times already. I would like to make my truck bomb proof in terms of internals. Last time i ran my Truck was more than a year a go because of the problems i keep getting which is getting really expensive. By the way I use a a series of 2s2p lipos which comes out at 14.4 V. Any suggetions? Ill be going to new jersey and san francisco this summer. Are there any shops i could go to ? or just order from mike and have it delivered to my father in laws house. Also, I'm kinda on a budget max is $200 as i spent a whole lot on my truck already. Actually the Mrs. is kinda totally against fixin my truck.!!!! help!