I've had My shocks blow apart befor as well.. BUT that was from driving it really hard!, I've bent dog bones and got really deep grooves in My cups,
Now for the grooves in the cups, Here's the reason, This really only happens to the buggies, Any and all buggies no matter what brand are ment for smooth dirt tracks obviously with decent jumps, BUT if You are running them in Your back yard lets say ( like I know I did a lot ) the long grass, Uneven ground really takes a toll on the cups, You might not see it but Your buggy really takes a beating, There a lot of strain on those part from all the quick stopping and acceleration, bumpy ground etc. Trust Me on this, I have a buddy who races a buggy and He knows first hand that they are strickly track RC's or on the road next to Your house!, It's like taking a Subaru WRX rally car through a pile of tree stumps, Yes it's 4x4 but not for that reason lol.. I usualy take mine to the dirt running track at our local high school here
All I could wish for is redcat to come out with stronger dog bones and drive cups. I have bent and dmg a few dog bones. And I am noticing the drive cups for the drive shaft mostly the rear drive shaft is getting grooves worn into it. The drive cups for the axel don’t seem to be doing that. I am assuming the rear drive shaft takes most of the torque from the engine which is decreased through the gears bye the time it gets to the wheels.