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PSC – BIG BORE XD Steering Cylinder Assist Kit for 2003-06 Jeep TJ with Aftermarket D60 – SK251


The perfect steering cylinder assist kit for your 2003 – 2006 Jeep Wrangler TJ or LJ with Aftermarket D60.

SKU: SK251 Categories: , Tags: ,

Application: 2003-06 Jeep TJ 4.0L with Aftermarket D60 Axle

Oversized tires, differential lockers, and rock obstacles will quickly have your factory power steering system crying for help.

A PSC hydraulic assist cylinder steering system is the solution to turn those much bigger tires like they are stock, whether on or off-the-road. Increase the turning force by an average of 50 percent with a PSC Cylinder Assist Steering System featuring a new steering gearbox that has been modified for cylinder assist while maintaining stock handling, control, and road feel with zero oversteer.

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


  • SG400R Steering Gearbox Conversion replaces failure-prone OEM ZF component
  • Increased Torque Output
  • Relieves stress on steering gearbox and frame mounts
  • Steering Assist Cylinder acts as a dynamic steering stabilizer
  • Compatible with OEM serpentine belt


  • SG400R Steering Gearbox
  • PK1852 Power Steering Pump and Remote Reservoir Kit
  • Inlcudes HK2000 High-Pressure Hose Assembly
  • Steering Assist Cylinder Kit with Hardware
  • Assist Cylinder Installation Hose Kit
  • SWEPCO 715 Power Steering Fluid

Due to the increased overall size of the SG400R, some applications may require a 1″ body lift to clear interference issues of the high pressure and return lines.

Some applications may require the modification of the factory steering shaft, shortening it by approximately two (2) inches.

PSC recommends SWEPCO 715 Power Steering Fluid in all PSC Steering Systems.

Positive caster increases align torque, aka the force that straightens the steering wheel when you go forward, which improves straight-line stability of the car. Due to the geometry of positive caster, this will also increase negative camber gain when turning, which will enable a wider tire contact patch. The caster angle is a major contributor to directional control. An insufficient amount of positive caster angle will decrease driver effort at the steering wheel, but may make the vehicle too sensitive and twitchy, especially as speed increases. To achieve the best on-the-road driving experience with larger tire sizes, the recommended front axle caster setting is 6-7 degrees positive.


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 69 lbs
Dimensions 15 × 15 × 16 in


Jeep Type