TRANSFER CASE OIL PUMP : This oil pump will fit several different New Process transfer case units, please see below: * NP231 * NP233 * NP241C * NP241D * NP241DHD * NP242 * NP243 * ** The pump drive gear has 38 splines where it fits on your main shaft ** (Tooth Count Is Where the Driveline Connects and NOT a Spline Count on the PUMP) ** please verify your spline count before purchasing ** Our transfer case oil pumps are of the highest quality and meet all standards set by professional installers. New Process - Direct fit 38 splines where it fits on your main shaft ASIN B07ZPK9RJN Brand Vital Parts Manufacturer Vital parts Manufacturer Part Number 16209