Milodon's Oil Pump Drive Shafts are machined from 4130 chrome moly and centerless ground to avoid stress risers. Race proven, these shafts eliminate the breakage-prone stock drive shafts that frequently fail when used with high volume oil pumps, heavy racing oil and high RPM's. Drive shaft ends are heat-treated to reduce wear and are a good insurance policy at an affordable price, for any application. Note: Chevy drive shafts use pinned steel collars instead of plastic.