Am I Dumb

I have the stock stampede tranny mounted in my truck. It works but i havent put any serious power to it, just the 12t stampede motor and esc. The diff definately needed to be locked so i took the jb weld to it. Its way too slow and i wanted to consider my options before spending money on what started out as a low budget project. I was just intrested in having an alluminum tranny with all metal gears for under 150 bucks when doing so to an emaxx trans would cost much more. I also like the idea that the stampede trans is easy to work on. i am just curious. thanks for the response