PSC SK689R36JP3-8.0W-1.375 Big Bore XD Cyl Assist, JL/JT 3.6L (20-Up), 8 Stroke, 1-3/8 Clamp

You’ve lifted your JL or JT, slapped on 37s or bigger, and now your steering feels like a workout — this kit’s your fix.

PSC’s legendary BIG BORE XD Cylinder Assist Steering Kits are built to handle the extra load and torque that come with oversized tires, beefed-up axles, and all the gear you’ve bolted on. Whether you’re aired down and off-roading, towing, or just daily driving and mall crawling, this is a critical upgrade that’ll make your Jeep steer like it should.

PSC bumped the stock 70 mm piston to a beefy 80 mm for more torque, and upgraded the sector shaft from 42 mm to 45mm to eliminate the all-too-common shear problem. Don’t trust sensors and computers to decide how much pressure you need? Good — this kit includes a belt-driven, mechanical pump that puts you in control.

Every kit comes complete with a steering gear, pump, pre-fab hose assemblies, fluid cooler, PSC’s 715 Power Steering Fluid, and your choice of a Tie Rod Clamp or No-Weld Brackets for unmodified factory axles and tie rods.

Running factory or aftermarket axles? Third-party tie rod? No problem. Just pick the right axle travel length (6.75in, 7.5in, or 8.0in) and clamp size to match your setup — and you’re good to go.

This listing is PSC part number SK689R36JP3-8.0W-1.375 (Axle Type: Aftermarket; Axle Stroke: 8in; Tie Rod Clamp Size: 1-3/8in).

Features

• Easily turns big tires—no more arm wrestling your Jeep
• Mechanical pump = reliable, constant power without computer control
• Built tough to ensure minimum maintenance and maximum fun

Specifications

• Part Number: SK689R36JP3-8.0W-1.375
• Axle Type: Aftermarket
• Axle Stroke: 8in
• Tie Rod Clamp Size: 1-3/8in

Installation Notes

• If you’re running a Synergy MFG Track Bar Brace (or similar), you must add the HWK-689-PP Bolt Kit.
• Do not use the factory or PSC-supplied 90mm bolts with a brace — it can lead to catastrophic gear case failure.
• Also note: the larger High Performance Steering Gear may not clear some aftermarket track bars.
• Ideal for: JL/JT owners running 35in and larger tire sizes, upgraded front axle, and larger diameter tie rods

Fitment

• 2021+ Jeep Wrangler JL 3.6L non-eTorque
• 2020+ Jeep Gladiator JT 3.6L

What’s Included

• BIG BORE XD Steering Gear
• High Performance Pump Kit
• Assist Cylinder Kit
• Tie Rod Clamp
• Hose assemblies, AN Adapter Fittings (if applicable), Fluid Cooler, SR-VT Anti-Splash Valve, and PSC Power Steering Fluid