S&S replacement pinion gear for late 1977 - 1989 big twins in Harley-Davidson motorcycles are carefully machined, heat treated and then finish ground. Red color code pinion gears measure 1.4729"-1.4737" over .105" pins for cam gears that measure 2.7354"-2.7364" over .105" pins. Harley-Davidson part number 24043-78. Note: All reference to H-D part numbers is for identification purposes only. We in no way are implying that any of S&S Cycle's products are original equipment parts or that they are equivalent to the corresponding H-D part number shown. S&S Part #: 33-4144

Cross-Reference: The following OEM numbers are provided for reference only and may not be completely accurate.
Harley OEM Cross Reference Numbers:
24043-78