Each set contains the drive
pinion assembly and the 3 pinion
gears. We offer these in an original size
version and an oversize version. The
drive pinion on the original is made to the Ford specs. The oversize kit has a larger diameter on the drive pinion where it passes through the gear cover. This way, you ream your gear cover for a perfect fit. The pinion gears in both kits are bored for the new T-3518
pins which are slightly larger than originals. USA