Big Bore Xd® Cylinder Assist® Steering Kit - Ford F-250/F-350 Super Duty (2005-07/2007)

If you’ve got a 2005–2007 Ford F-250/F-350 Super Duty and the steering feels like it’s wrestling you back — especially with big tires or heavy loads — this kit’s your answer. The BIG BORE XD Cylinder Assist Steering Kit is PSC’s top-tier solution for trucks that need serious steering help.

This setup includes our XD Steering Gear with a beefed-up sector shaft, a bolt-on Cylinder Assist system to help move those oversized tires without beating up your gear, and a full supply of PSC 715 fluid to keep everything running smooth. It’s built for real trucks that work hard and play harder — not for mall crawlers.

Heads‑up for installers

• Bolt-on install — no welding required
• Make sure your axle housing and diff cover leave room for the Cylinder Assist mount
• Use all four bottles of PSC 715 fluid for proper fill and break-in

What’s included

This kit ships in three boxes, and every part in here is new — not reman, not recycled, and not something you’ll regret installing.

BOX 1

• SG753R: BIG BORE XD Steering Gear Built with a larger sector shaft and internal bearings to handle serious steering loads. Ported for Cylinder Assist® and ready to bolt in.

BOX 2

• CAK75XR-OE: Cylinder Assist Axle Mount Kit Includes the 1.75 x 8.0 Assist Cylinder, hose kit, and OE-style tie rod clamp. Helps move big tires without beating up your gear.

BOX 3

• FL-SWE715-4PAK: PSC 715 High-Performance Power Steering Fluid Four bottles — enough to fill and break in the system properly. Don’t skip this step.