Well i finnaly broke a rear Diff cup, it was the one that came with the upgrade kit, and i was looking at rampage hop-ups and it sayed (Differential Joint Cups Heat Temepred by RAMTech-RC. Please see the Aftermarket section for Tempered Diff cups.). But i cant find them on there the only ones i can find are the Stock diff cup the small hole ones, i don't need to buy the diff cup all ready temepred but it would be nice since i have never tempered any thing before