Cure the dreaded "Pump Rub" with PPEs Transfer Case Pump Upgrade kit. Pump rub occurs when the 5 positioning tabs holding the pump in place wear over time, thus causing the oil pump to come into contact with the housing itself. The result is a hole in the cover, causing fluid to leak and the possibility of heavily damaging the transfer case. PPEs kit consists of a new pump cover whose main feature is a more secure method of mounting the pump. All the necessary gaskets are included.