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BIG BORE XD® Cylinder Assist® System - Jeep Wrangler TJ/LJ 4.0L (2003-2006)

BIG BORE XD® Cylinder Assist® System - Jeep Wrangler TJ/LJ 4.0L (2003-2006)

$2,950.00
$2,950.00
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Part Number: SK250

Actual Steering Measurement

Built for Jeep TJ and XJ owners running Ford D60 axles, these PSC steering kits are the real deal — no reconditioned parts, no guesswork. Whether you're going full Cylinder Assist or just upgrading your gear and pump, each kit includes everything you need to get your vehicle steering like it should.

From silver PSC steering gears and high-performance pumps to reservoirs, coolers, hoses, clamps, mounts, and fittings — plus PSC 715 fluid to keep things smooth — these kits are built to handle serious trail abuse and deliver reliable control. Weld-on options available for custom setups.

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About:About:

Why you’ll love it

  • Brand-new PSC components — no reconditioned parts
  • Designed for Jeep TJ/XJ with Ford D60 axles
  • Built to handle real-world trail abuse
  • Complete kits with everything you need
  • Cylinder Assist options for serious steering control

Tech InfoTech Info

Heads‑up for installers

Some kits include weld-on components. Make sure your axle setup matches the application. All hardware and fittings are included, but professional installation is recommended for best results.

Fitment

  • Jeep TJ (1997–2006)
  • Jeep XJ Cherokee (1984–2001)
  • Must be equipped with Ford D60 front axle

Use it with

  • Jeep TJ and XJ builds running Ford D60 front axles
  • High-articulation suspension setups
  • Larger tires and off-road steering upgrades

Ideal for

  • Off-roaders who want better steering control
  • Jeep owners upgrading to Cylinder Assist®
  • Trail rigs with big tires and heavy-duty suspension

Specs

  • Stroke: 6.0"
  • Steering Gear: BIG BORE XDR (SG400R)
  • Pump Kit: High Performance Pump Kit for TJ/LJ 4.0L (PK40JP2)
  • Axle Kit: Cylinder Assist w/ 6.0" Stroke (CAK400R-6)

What’s included

Each kit includes:

  • PSC Silver Steering Gear
  • PSC Pump Kit
  • Cylinder Assist Kit (SK250, SK251, SK252, SK253)
  • Reservoir (branded or unbranded depending on kit)
  • Cooler, hoses, clamps, mounts, fittings
  • 4 bottles of PSC 715 fluid
California Prop 65 Warning

California Prop 65 Warning

This product can expose you to chemicals including lead and di (2-ethylhexyl) phthalate, which are known to the State of California to cause cancer, birth defects or other reproductive harm.

For more information, go to www.P65Warnings.ca.gov