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.
For the daily driver or a project that is not quite ready for a steering assist cylinder installation, we offer the Adventure Series Kit with Cylinder Assist™ capability.
Every PSC BIG BORE XD Cylinder Assist Steering Kit is complete with everything needed for a successful installation.
2007-11 Jeep JK 3.8L with Unmodified OEM Axle (for modified axle use SK688R38JP1-6.75W)
SG688R Big Bore XD Steering Gear
Complete Pump Kit: Includes Fluid Reservoir, Fluid Cooler, Fluid Anti-Splash Valve, Serpentine Drive Belt, Brackets, Hoses, & Fittings, and 4 QTS SWEPCO 715 Power Steering Fluid
*NOTE* Not compatible on vehicles equipped with a supercharger.
No-Weld, Bolt-On Assist Cylinder Kit, includes 1.75 X 6.75 Assist Cylinder, No-Weld, Bolt-On Assist Cylinder Mounting Bracket, Assist Cylinder Installation Hose Kit, Rod Ends and Tie Rod Clamp
Use HWK-688-PP hardware kit when installing a Synergy MFG Track Bar and Sector Shaft Brace with this product.
Using the 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 driveability, 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.
When ordering please specify tie rod clamp size in order notes or call us at