No ive had no problems at all. But im also running the stock spring. If you put in the ddm 7500 rpm or the hpi 8000 rpm springs it might be different. cause it will be puttin more torque on the drive train instantly. But i just spin the tires in dirt, and i would assume it would do the same with the 4wd.

The only real problems ive heard with the drive train are the dog bone cup shafts breaking. But that was mainly when they first came out, i think they fixed that problem though.