PSC Cylinder Assist Steering Kit for 2018–2020 Jeep JL 3.6L – OE Axle & Tie Rod (SK689R36JP2‑OE)

Upgrade your Jeep Wrangler JL’s steering with the PSC Cylinder Assist™ Steering Kit (SK689R36JP2‑OE), tailored for 2018–2020 JL models powered by the 3.6L Pentastar engine and equipped with factory axles and tie rods.

Built around PSC’s Big Bore XD Cylinder Assist™ gearbox, this kit replaces the OEM 42 mm sector shaft with a beefier 45 mm shaft and ups the piston size from stock to an oversized 80 mm unit, dramatically increasing steering torque—perfect for 35" tires and bigger

A reliable belt-driven, high-flow mechanical pump kit (PK36JP2) eliminates the stock electric pump’s overheating issues under heavy loads. The kit includes a 6.75″ stroke cylinder assist axle kit (CAK689R‑OE) for direct axle mounting, paired with an OE-compatible tie rod clamp—no welding required

What's Included

• SG689R Big Bore XD Cylinder Assist™ steering gearbox

• PK36JP2 high-flow mechanical pump with reservoir

• CAK689R‑OE 6.75" stroke assist cylinder axle kit

• OE-compatible tie rod clamp

• Full hose, fitting, cooler, anti-splash valve, and SWEPCO fluid kit

Performance Gains & Benefits

• Eliminates excessive on-center steering play

• Prevents electric pump overheating under stress

• Enables effortless steering for 35"+ tires and locked differentials

• Acts as a dynamic steering stabilizer, significantly reducing driver fatigue

Installation & Compatibility

• Bolt-on design fits unmodified factory axles and tie rods—ideal for daily drivers or lightly modified rigs

• A Tazer JL programmer is required to disable the stock EHPS when running the mechanical pump

• When using certain track bar braces, the HWK‑689‑PP hardware kit and SYN‑8869‑10 sealant are recommended to avoid gearbox case failure

• Lifted rigs, aftermarket track bars, or different axle setups may require clearance modifications due to the larger gearbox size