MW 9" and 12" modular rears are set up to accept a fluid pump to circulate rear end lubricant from the back of the housing forward to the pinion bearings and the gear contact area to extend bearings and ring and pinion life. Pump is driven off the rear of the pinion shaft. Pump assembly includes pump shaft, required fittings, braided hose, and fasteners. Requires 3/8" hex in pinion shaft - p/n 91110.

Installation - Service instructions can be found on Service Bulletin #0055