Product description
Each set contains the drive pinion assembly with 9 teeth and the 3 pinion gears with 13 teeth. This is the stock version, drive pinion is .939" where it goes through the gear cover. The pinion gears are drilled for the reproduction T-3518 pins which are slightly larger than originals. This is known as the 5:1 ratio gear set which was used in 1926-27
OEM: T-3517-BS