The rollar cage in the diff is plastic. They used to be aluminum.

 

i hear about this problem on all 2x4 models from any company. i have a polaris magnum 4x4 when doing burnouts the fronts never egaged. on a friends honda 2x4 his fronts engaged and cracked a front axle.when doing donuts i think the spining causes one of the tires to move (bend like a v) in along with the cv joints then egage diff or if its the egages at the hubs the tire to bend like a v and egaging the hubs.also having the quad tip on its side when spinning can cause damage to the diff. i dont know where the the 4 wheel drive egages on magnums i was wounding about it myself. i think its the diff because theirs a wire that connected to it. this problem would keep me from getting a 2x4 model not a 4x4 model. the only way for a 4x4 to have this problem is if the switch fails.