Square Root Fabrication L5P Duramax Modified Factory Oil Pump

Upgrade your L5P Duramax oiling system with the Square Root Fabrication Shimmed, Pinned, and Welded Factory Oil Pump. Starting with a genuine OEM oil pump, SRF precision-shims the gear, drills and pins it directly to the shaft, then finishes the modification by TIG welding the gear in place for improved retention and durability.

For customers looking for additional reinforcement, we also offer an optional CR2 Fabrication Oil Pump Pin Kit, providing an additional pinning solution for securing the oil pump gear to the crankshaft.

Designed for high-performance and demanding Duramax applications, this reinforced factory oil pump provides added security while maintaining the OEM design. Ideal for tuned trucks, high-horsepower builds, heavy towing applications, and competition pulls where reliability under increased engine loads is critical.

Optional Upgrade: CR2 Fabrication Crankshaft Pin Kit

The CR2 29610 L5P Duramax Oil Pump Pin Kit secures the oil pump drive gear and harmonic balancer to the crankshaft using a hardened roll pin. This helps prevent the components from slipping on the crankshaft, particularly in high-RPM applications.