8-3/4″ Diff with 1-3/8″ & 1-7/8″ Pinion Seal


Each. Fits 741 and 489 Case



Aftermarket replacement Pinion Seal for all 8-3/4″ Differentials with the 1-3/8″-741 Case, and 1-7/8″-489 Case Tapered Pinion Gear. The Outside Diameter of this Seal is 2.80″ and 1/2″ Thick. Some of the early 741 Cases do not have the casting # on the side of the Case below the Pinion Gear so you may need to disassemble it to I.D. it as to what case it is, either a 741 or a 742. Also there was different Seal Outside Diameters and thickness’s used on the 741 Cases in the late 50’s and early 60’s, so be sure that yours will use this Seal before ordering. Replaces OEM Part #’s 1738831, 2404121 and 2931862.