PSC Cylinder Assist Steering Kit for '12-'18 Jeep JK 3.6L with Aftermarket Front Axle 8.0" Lock-to-Lock


  • Brand: PSC Steering
  • Availability: In Stock
  • Part Number: SK688R36JP1-8.0W-1.25

  • Expected time to ship, 7-10 business days

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, 1.5" 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.



2012-2018 Jeep JK 2 Door or 4 Door 3.6L with most Aftermarket Dana 60 (1-Ton) Axles



  • Eliminates excessive on-center steering wheel "play"
  • Eliminates pump overheating
  • Increased Torque Output turns 37" and larger tire sizes 
  • Improved turning capability when locking differentials are engaged




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.

Cylinder Kit, includes 1.75 X 8.0 Assist Cylinder, Assist Cylinder Installation Hose Kit, Rod Ends and Hardware, and Tie Rod Clamp


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.