PSC – BIG BORE XD Cylinder Assist Steering Kit for 2007-11 Jeep JK 3.8L with OEM Axle – SK291


This PSC Steering Kit is the perfect solution for the daily driver Jeep JK/JKU that also likes to play off-the-road.

SKU: SK291 Categories: , Tags: ,

Application: 2007-11 Jeep JK 3.8L with OEM Axle

PSC has developed the BIG BORE XD Steering Kits to be the ultimate steering upgrade package for Jeep JK/JKUs equipped with locking differentials, aftermarket axles, and up to 44″ tire sizes.

All kits include our top of the line components including the BIG BORE XD Steering Gearbox, High-Performance Power Steering Pump Kit with Remote Reservoir, High Pressure Hose Conversion, Steering Assist Cylinder with Hardware, 1-3/8″ Tie Rod Clamp, Fluid Cooler, and SWEPCO 715 Power Steering Fluid.

Every PSC BIG BORE XD Cylinder Assist Steering Kit is complete with everything needed for a successful installation.


  • Big Bore XD Steering Gearbox

  • High Volume Pump and Reservoir Kit with Fluid Anti-Splash Valve

  • Upgraded OEM-Style High Pressure Hose Assembly

  • Fluid Cooler Kit

  • Steering Assist Cylinder

  • No-Weld Assist Cylinder Mounting Bracket with Hardware

  • Assist Cylinder Installation Hose Kit

  • Tie Rod Clamp

  • SWEPCO 715 Power Steering Fluid, QTY 3

WARNING! Use HWK-688-PP hardware kit when installing a Synergy MFG Track Bar and Sector Shaft Brace with this product. Using the SHORTER Factory or the standard PSC supplied bolts with the Synergy MFG Track Bar and Sector Shaft Brace could result in steering gearbox case failure.

The larger size of the BIG BORE XD Steering Gearbox may prohibit the use of some aftermarket track bars.

To achieve the best on-the-road drivability, recommended front axle caster setting is 7 degrees POSITIVE.

A high steer or drag link flip kit may need to be installed on vehicles with more than four (4) inches of lift.
There are no drop Pitman arms on the market that fit the Big Bore XD Steering Gearbox.

PSC recommends using SWEPCO 715 Power Steering Fluid in all Cylinder Assist Kits.

Note: Images are for illustration purposes only. Images MAY NOT represent the product listed. Please contact Customer Service with any questions or concerns: 928-227-2026.

Weight 87 lbs
Dimensions 17 × 17 × 16 in


Jeep Type