It's unfortunate you pretty much have to build these from scratch to get the ultimate basher but once you do they last forever. The only things I've done in 2 years of extreme abuse are replace bearings, bent hinge pins, bent skid plates, and the occasional cvd pin. I was having problems at first with diffs eating themselves but upgraded to cnc'd alluminum cases and heavy duty Hot Bodies diff gears and have not had any driveline issues in a long time.