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07-18 Jeep JK + JKU PSC Big Bore XD Steering Gear

The BIG BORE XD-JK is the most powerful and strongest replacement steering gear on the market for the Jeep JK. Any Jeep JK with larger tires and/or locking front differential needs this bolt-on upgrade. The BIG BORE XD-JK, when combined with our PK38JP1 or PK36JP1 Pump Kit, provides up to 35% more turning power over the factory steering gear.

The sector shaft diameter has been increased from 35MM to 45MM to handle the extra torque output and prevent shear in severe environments. Every Big Bore XD-JK Steering Gear includes a NEW proprietary Pitman arm designed for the larger sector shaft.

Improved on-the-road driving characteristics and significantly increased torque output are achieved by using a 16:1 80MM piston assembly. This increased torque output will turn tire sizes up to 35" without the installation of cylinder assist, and will enable you to enjoy superb on-the-road handling as well as tackle 1-4 rated trails with ease.


2007-2018 Wrangler JK/JKU


45MM Sector Shaft

NEW XD-JK Proprietary Pitman arm

16:1 Ratio 80MM Piston Assembly

Reinforced Mounting Pad and Case


46mm Pitman Arm Nut Socket

Pitman Arm Puller

Axle Caster Gauge

Tie Rod End Puller

Pneumatic Anaerobic Thread Sealant


WARNING! Add the HWK-688-PP Bolt Kit (110MM Long) when installing any Synergy MFG Front Track Bar Brace (or similar) with this product.

Using the Factory bolts (90MM Long) or the PSC supplied bolts (100MM Long) with a Synergy MFG Track Bar Brace could result in steering gearbox case failure.

WARNING! This product weighs approximately 57 lbs. Work safely and avoid physical injury by using appropriate lifts/tools and/or utilizing the assistance of a work buddy 

The BIG BORE XD-JK Steering Gear requires a power steering pump capable of approximately 1650 PSI. PSC highly recommends the use of a HIGH FLOW/HIGH-PRESSURE Pump Kit to ensure system efficiency and extend component life. These pumps operate at approximately 1650 PSI and produce 50% more volume than the OEM pump. Vehicle steering performance will be diminished if a high mileage or remanufactured component is used:

PK38JP1: JK/JKU 3.8L High Flow Pump Kit

PK36JP1: JK/JKU 3.6L High Flow Pump Kit

The larger size of the BIG BORE XD-JK Steering Gear may not fit with first generation aftermarket track bars. We recommend scheduling a consultation with a Professional Installer for an evaluation and an appropriate solution determination.

The supplied PSC proprietary Pitman arm does not have any additional drop to it.

Some applications may require a drag link flip kit for proper installation.

PSC: SG688

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