PSC Performance BIG BORE XD Cylinder Assist Steering Gear Box

If you’re tired of sloppy steering or fighting big tires on your Super Duty or Excursion, PSC’s BIG BORE XD Steering Gear is the upgrade you’ve been waiting for. This isn’t a rebuilt box—it’s a completely new design built from the ground up to handle serious off-road and towing demands.

If you're running a 2005 to mid-2007 Ford F-250 or F-350 and upgrading to a PSC Cylinder Assist system, this is the steering gear you need. It’s built from all-new components (no reman junk here), and features a splined input shaft for direct compatibility with your factory setup.

This gear is engineered to handle oversized tires, heavy-duty use, and off-road abuse—while keeping your steering smooth, responsive, and reliable. Just make sure to check your truck’s build date if you’re working on a 2007–2008 model. You’ll find it on the placard inside the driver’s side door B-pillar.

*This gear has a splined input shaft—double-check compatibility
*For 2007–2008 trucks, verify the production date before ordering
*Check the placard on the driver’s side door B-pillar for build info
*Works with factory-style pitman arms for this model range

Specs:
-Input Shaft: Splined
-Sector Shaft: Oversized for durability
-Bearings: Upgraded for smoother feel
-Compatibility: OEM and aftermarket pitman arms