Maybe stop hitting things so hard?
I dunno. The black ones hold up better then the silver ones.
Madcat - will depend on your engine, grip etc. If your running 1.0 module you have to change pinion and spur gear to change a ratio
0.8 allows you to just change the pinions!
Just listen to your engine see if its getting to max revvs too early or boggs and also listen for your 2nd gear shift point..