well i can tell you that the composite ones will always practicly crack with the 5.5
but the suspension also plays a roll on this
when the wheel is lifted off the ground during cornering then when the tire suddenly goes back on the ground there is a QUICK tension that was applied to the drivetrain thus breaking or twisting the dogbone
ill try the ft tc4 dogbones and if your still messing up dogbones...ill play around with the suspension
hope it helps
P.S.....NICE AVATAR