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BIG BORE XD® Cylinder Assist® Steering Kit – Jeep Wrangler JL 3.6L (2018+)

BIG BORE XD® Cylinder Assist® Steering Kit – Jeep Wrangler JL 3.6L (2018+)

$3,632.99
$3,632.99
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Part Number: SK689R36JP2-6.75W-1.5

Axle Type
Axle Stroke
Tie Rod Clamp Size

If you’re running big tires and your JL’s steering feels like a workout, this kit’s your fix. The BIG BORE XD Cylinder Assist Steering Kit is built to handle the abuse of off-roading and the demands of daily driving. It’s got the muscle to turn those tires with ease and the durability to keep you wheeling without worry.

We upgraded the stock 70 mm piston to a beefy 80mm for more torque, bumped the sector shaft from 42 mm to 45 mm for added strength, and swapped out the factory electric pump for a reliable belt-driven mechanical one. You get everything you need in one box—steering gear, pump, hoses, cooler, fluid, and your choice of tie rod clamp size.

Whether you’re crawling rocks or cruising pavement, this kit delivers smooth, confident steering that feels right.

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About:About:

Why you’ll love it

  • Turns big tires like a champ—no more fighting the wheel
  • Built tough with oversized internals for serious strength
  • Mechanical pump = consistent power, even under heat and load
  • Comes complete with everything you need—no guesswork

Heads‑up for installers

  • You’ll need a 46 mm socket for the pitman arm nut and a puller to remove it
  • Caster gauge and tie rod end puller make install smoother
  • Use pneumatic anaerobic thread sealant for leak-free installs
  • IMPORTANT: If you’re running a Synergy MFG Track Bar Brace (or similar), you must add HWK-688-PP and SYN-8869-10. Using factory or PSC bolts with that brace could cause gear case failure.
  • The larger size of the BIG BORE XD2 steering gear may not clear some aftermarket track bars 

Fitment

Jeep Wrangler JL/JLU 3.6L Non-eTorque (2018–2020)

What’s included

Each kit includes:

  • (SG689R) BIG BORE XD® Steering Gear (not sold separately)
  • (PK36JP2) XD Pump Kit for JL 3.6L Non-eTorque
  • Cylinder Assist™ Axle Kit (stroke length varies by kit)
  • Tie Rod Clamp (size varies by kit or not included)
  • Hoses, fittings, cooler, anti-splash valve, and PSC fluid
California Prop 65 Warning

California Prop 65 Warning

This product can expose you to chemicals including lead and di (2-ethylhexyl) phthalate, which are known to the State of California to cause cancer, birth defects or other reproductive harm.

For more information, go to www.P65Warnings.ca.gov