Not sure what you need?
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.
We bumped the stock 70mm piston to a beefy 80mm for more torque, and upgraded the sector shaft from 42mm 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 (6.75", 7.5", or 8.0") and clamp size to match your setup — and you’re good to go.
Kit Includes:
- SG689R Big Bore XD-JT Steering Gear Box
- High Flow Mechanical Pump Conversion Kit
- Jeep JT Reservoir Kit
- Upgraded High Pressure Hose Assembly
- Upgraded Return Line Kit
- Steering Assist Cylinder Kit with Hardware
- Fluid Cooler Kit
- SWEPCO 715 Power Steering Fluid
- Necessary hardware
- Installation instructions
Notes:
** Use HWK-689-PP (available separately) hardware kit when installing the Synergy MFG Track Bar and Sector Shaft Brace with this product. Using the shorter OEM or the standard 100MM bolts supplied with the XD-JL Steering Gearbox could result in steering gearbox case failure.
*** The larger size of the BIG BORE XD2 Steering Gearbox may prohibit the use of some aftermarket track bars.
**** A Tazer JL Programmer (Tazer JL & Tazer JL MINI) will need to be purchased to override the OEM electro-hydraulic pump functions when installing the PSC High Flow Mechanical Pump Conversion Kit
***** Positive caster increases align torque, aka the force that straightens the steering wheel when you go forward, which improves straight line stability of the car. Due to the geometry of positive caster this will also increase negative camber gain when turning, which will enable a wider tire contact patch. The caster angle is a major contributor to directional control. An insufficient amount of positive caster angle will decrease driver effort at the steering wheel, but may make the vehicle too sensitive and twitchy, especially as speed increases. To achieve the best on-the-road driving experience, recommended front axle caster setting is 7 degrees positive.
****** PLEASE ALLOW A LEAD TIME OF 7-10 BUSINESS DAYS FOR PRODUCTION AND SHIPPING DEPENDING ON DEMAND. FEEL FREE TO CONTACT US PRIOR TO ORDERING FOR A CHECK ON INVENTORY
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