I sold my Slash 4x4 after that bearing blew up on me in 2 different a mains ! The last one was an Avid bearing that I put in that same race day and it only had 4 runs on it when it blew up taking the center diff case and the spur gear out with it .

Bought a Hyper 10SC and have been VERY happy with it , the only things I have broken with it have been from my driving and not from something silly like that bearing .

The King Headz mount looks too be THE fix for this problem though and its what I would try before investing in expensive bearings that are still gonna fail after a while .