Called RCV- they said it broke the way they break.
287$ option to upgrade the shaft to 300M, or free warranty of the 4130 shaft.
the upgraded 300M kit has 300M CV's so ill just warranty the shaft, and get another full set of 300M RCVs.
he was very supprised to hear 300hp and 44" tires broke a shaft. same response copper fab gave me when i was the only guy to break one of there sway bars so far. Cant wait to break a solid knuckle next!