PSC Performance Duramax XD Cylinder Assist™ Steering Box.The OEM steering gearbox in these trucks have always been a problem until now.

The factory steering gear in these trucks has always been a weak spot—until now. PSC’s BIG BORE XD Steering Gear is built to handle the demands of lifted trucks, oversized tires, and serious off-road use. With a beefed-up 45mm sector shaft and upgraded roller bearings, this gear eliminates the deflection and seal failures that plague OEM units.

Whether you’re running a standard setup or PSC’s Cylinder Assist system, we’ve got the gear for you. All-new components, no remanufactured parts, and PSC’s proven durability make this a must-have upgrade for your GM 2500/3500 or Hummer H2.
All PSC power steering components are manufactured from the highest quality materials. From the daily driver to the rock-crawling rig, PSC has the high-performance power steering components you need to make transport a safe, reliable, and enjoyable experience.

FEATURES:
Sector Shaft: 45mm diameter
Bearings: Upgraded roller bearings
Ports: Standard or Cylinder Assist® (SG039R)
Build: All-new components, not remanufactured

TECHNICAL NOTE:
Requires PA806 4-Master Spline Pitman Arm.
Make sure to flush and bleed the system properly.
Cylinder Assist version includes ports for ram assist plumbing.