2 Pack Meritor Nut P/N: 40X1237. Meritor differential parts. We stock differential parts, bearings, shims, input shafts, pinion gears, snap rings, spacers, and anything else needed to rebuild your Meritor differential.Interchanges:Navistar 2000231Navistar 2000231C1Used in 20 Meritor modelsShow all 20 models140/141/143/144/145 Series Drive Axle160/161/164 Series Drive AxleMD-20-14X Drive AxleMODH2P019 / MORH2P019 Planetary Tandem AxleMORH2P032DS4001 / DD4001 Off-Highway AxleMORH2P032DS4005 Off-Highway AxleMORH2P032DS4011 Off-Highway AxleMOXH2 Off-Highway AxleMOXN5 Off-Highway AxleMRH2PW Drive AxleMTC-3124 Transfer CaseMXH2PW Drive Steer AxleRD-20-145 Drive AxleRD-23-160 Drive AxleRT-40-145 Drive AxleRT-40-160 Drive AxleRT-46-160 Drive AxleRT-46-164EH Drive AxleT-2119 Transfer CaseTG-2213 Transfer CaseThis unit is sold in packs of 2.Tech SpecsCarrier Model: RS145Differential Carrier Model: 145