Bigger tires, harder trails, and heavier loads can overwhelm a stock JK/JKU steering box. This PSC steering gear is designed to bring back a more confident, predictable steering feel and add the durability needed for demanding use.
It’s a direct-fit upgrade for JK/JKU 2007–2018. Choose the Cylinder Assist®-ready version if you plan to run (now or later) a hydraulic assist ram, or choose the Replacement Gear option if you’re staying without assist ports.
PSC XD Cylinder Assist® steering gear for Jeep Wrangler JK/JKU (2007–2018)
The PSC XD Cylinder Assist® Steering Gear is built to handle higher loads while keeping steering control consistent. With integrated assist ports and heavy-duty construction, it’s a strong foundation for a robust steering system on and off road.
Why it’s worth it
- Designed for increased steering capability when paired with the recommended PSC pump setup.
- Integrated -6AN ports for Cylinder Assist® (assist-ready without modifying the gear).
- Includes a PSC pitman arm matched to the larger sector shaft (depending on chosen option).
- Heavy-duty build to better tolerate off-road steering loads and larger tire setups.
- Choice of assist-ready upgrade or non-ported replacement option to match your build plan.
Application / Fitment
Built for direct installation on the following vehicles:
- Jeep Wrangler JK/JKU
- Model years: 2007–2018
Variants / Options
Steering Gear Orientation
- Left-Hand Drive
- Right-Hand Drive
Are you planning on adding Cylinder Assist® Now or in the Future?
- YES! Upgrade – Cylinder Assist® gear with assist ports.
- No – Replacement steering gear without assist ports.
Specifications
- Part Number: SG684
- Sector Shaft: 45mm
- Turning Ratio: 16:1
- Piston Assembly: 80mm
- Input Shaft: 3/4" – 30 spline
- Mounting: Reinforced 4-bolt pad
- Ports: -6AN for Cylinder Assist®
- Covers: Billet aluminum top and end cap
Important before installation
- Cylinder Assist® Gear requires a high-flow / high-pressure pump (PSC recommends PK38JP1 or PK36JP1).
- Approx. gear weight is about 57 lbs — plan safe lifting and installation.
- If using a Synergy MFG Track Bar Brace, a HWK-688-PP Bolt Kit (110mm) is required.
- Some factory or PSC-supplied bolts may damage the housing with certain aftermarket braces.
- Included pitman arm has no additional drop; some setups may require a drag link flip kit.
- Pump, assist cylinder, and bolt kits are sold separately.
What’s included
- Cylinder Assist® Gear: (1) BIG BORE XD® Cylinder Assist® Steering Gear, (1) PSC Proprietary Pitman Arm
- Replacement Steering Gear: (1) PSC Replacement Steering Gear (no assist ports), (1) PSC Standard Pitman Arm
Recommended for
- JK/JKU owners who want a stronger steering gear for harder use and improved control.
- Builds planning Cylinder Assist® now or in the future (choose YES! Upgrade).
- Drivers who want a heavy-duty replacement without assist ports (choose No).
Mini FAQ
Will this fit a Jeep Wrangler JK/JKU 2007–2018?
Yes — the listed fitment covers Jeep Wrangler JK/JKU model years 2007–2018.
What’s the difference between Cylinder Assist® Gear and Replacement Steering Gear?
The Cylinder Assist® Gear includes integrated -6AN assist ports for Cylinder Assist®. The Replacement Steering Gear has no assist ports and is intended for non-assist setups.
Is a pitman arm included?
Yes. The Cylinder Assist® option includes a PSC Proprietary Pitman Arm, and the Replacement option includes a PSC Standard Pitman Arm.
Do I need a special pump for the assist-ready version?
Yes — for the Cylinder Assist® Gear, PSC recommends a high-flow / high-pressure pump (PK38JP1 or PK36JP1).
Are the pump, assist cylinder, and bolt kits included?
No — pump, assist cylinder, and bolt kits are sold separately.
Select the correct orientation (Left-Hand Drive / Right-Hand Drive) and choose whether you want Cylinder Assist® capability. Before purchase, confirm compatibility with your current steering/suspension components (especially track bar braces) and plan the supporting parts required for your intended setup.
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