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XD Cylinder Assist® Steering Gear – Jeep Wrangler JK/JKU (2007–2018)

XD Cylinder Assist® Steering Gear – Jeep Wrangler JK/JKU (2007–2018)

$1,350.00
$1,350.00
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Part Number: SG684R

Steering Gear Orientation
Are you planning on adding Cylinder Assist® Now or in the Future?

The SG684 Series gives you the right steering gear for your Jeep Wrangler JK or JKU—whether you're replacing a worn-out factory box or stepping up to a full Cylinder Assist® setup.

At the base level, the SG684 is a brand-new OEM-style replacement that bolts in like stock and restores proper steering feel. 

For builds that need more control and strength, the SG684R Cylinder Assist® gears take it further. These units are equipped with PSC’s integrated valve housing and upgraded components to run a hydraulic assist cylinder—giving you the steering authority you need for bigger tires, tougher terrain, and real off-road use.

Available in both left-hand drive and right-hand drive configurations depending on your build.

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About:About:

Why you’ll love it

  • Direct-fit replacement for 2007–2018 JK/JKU platforms
  • Cylinder Assist® options available for serious builds
  • Improves steering feel, control, and consistency
  • Includes key seals and hardware to make install straightforward

Tech InfoTech Info

Heads‑up for installers

  • Verify LHD vs RHD before ordering
  • Cylinder Assist® gears require a full assist setup (cylinder, lines, pump, and reservoir)
  • Proper system bleeding is critical for performance and longevity
  • Always check pump condition, fluid, and hoses when replacing a steering gear

Fitment

  • 2007–2018 Jeep Wrangler JK (2-door)
  • 2007–2018 Jeep Wrangler Unlimited JKU (4-door)
  • Available for Left-Hand Drive (LHD) and Right-Hand Drive (RHD) applications

Use it with

  • PSC Cylinder Assist® kits (for SG684R models)
  • Upgraded PSC pumps and remote reservoirs
  • Fresh fluid and properly matched steering components

Specs

  • Sector Shaft: 36 mm
  • Turning Ratio: 16:1
  • Piston Assembly: 70 mm
  • Input Shaft: JK 3/4 DD
  • Cylinder Assist Ports (SG684R ONLY): -6 AN (3/8”)

What’s included

  • SG684 or SG684R Steering Gear (Pump kits and Cylinder Assist Cylinder or Axle Kits sold separately)

SupportSupport

Install Instructions

OEM Cross Reference

Direct Replacement for:

  • Mopar 68052897AE
  • Mopar 52126348AE
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