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  • Black PSC steering gear assembly displayed with pitman arm and mounting hardware on a white background.
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BIG BORE XD® Steering Gear – Jeep Wrangler JK / JKU (2007–2018) – PSC Certified Refurbished

BIG BORE XD® Steering Gear – Jeep Wrangler JK / JKU (2007–2018) – PSC Certified Refurbished

$600.00
$1,150.00 $600.00
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Part Number: SD-SG688

These are PSC Big Bore XD steering gear upgrades for 2007–2018 Jeep Wrangler JK and JKU models, offered as PSC Certified Refurbished units.

Each unit has been inspected, rebuilt where needed, and tested to meet our performance standards. They may show minor cosmetic wear from prior use or handling, but they are fully functional and built to perform the same as our standard units.

This is the same Big Bore XD steering gear designed to handle larger tires, added weight, and tougher use where the factory box starts to fall off. Internals are built for durability and consistent steering feel, especially when the Jeep is seeing trail use or being pushed hard.

If you’ve been needing to step up your steering without paying full price for a brand-new unit, this is a solid way to do it.

All refurbished unit sales are final.
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PSC TRAIL SCORE

3/5

Weekend Warrior

Balanced for street and moderate trails—think mild rock and mud.

About:About:

Why you’ll love it

  • 45mm sector shaft – nearly 30% bigger than stock for serious strength
  • 16:1 ratio with 80mm piston – more torque, better road feel
  • Includes PSC proprietary Pitman arm – no guessing, no mismatched splines
  • Bolt-on upgrade – fits JK/JKU with factory mounts
  • Handles 35s without assist – and Cylinder Assist® makes it unstoppable

Tech InfoTech Info

Heads‑up for installers

  • Weight warning: This gear tips the scale at ~57 lbs. Use a jack or a buddy.
  • Track bar brace caution: If you’re running a Synergy MFG
  • Front Track Bar Brace (or similar), you must add PSC HWK-688-PP Bolt Kit (110mm). Using factory or PSC 100mm bolts can crack the case.
  • Pump matters: This gear needs a pump that can deliver ~1650 PSI and 50% more flow than stock. PSC pump kits are tuned for it.
  • Bleed it right: Front tires off the ground, engine off, cycle lock-to-lock, then recheck fluid.
  • Pitman arm note: Supplied arm has no extra drop. Some setups may need a drag link flip kit for proper geometry.
  • Recommended Tools:

    46mm Pitman Arm Nut Socket
    Pitman Arm Puller
    Tie Rod End Puller
    Axle Caster Gauge
    Pneumatic Anaerobic Thread Sealant

Fitment

  • 2007–2018 Jeep Wrangler JK & JKU
  • Direct bolt-on for factory steering gear location
  • Works with most aftermarket track bar braces (see bolt note above)

Use it with

  • PK38JP1 – High-Flow Pump Kit for 3.8L JK
  • PK36JP1 – High-Flow Pump Kit for 3.6L JK
  • PSC Cooler and Inline Filter (always a good idea on big steering systems)
  • PSC Cylinder Assist® Kit for JK (if you’re stepping up to 40s or hardcore trails)

Ideal for

  • JKs on 35s–40s
  • Rigs with front lockers or heavy bumpers/winch setups
  • Daily drivers that double as weekend trail rigs
  • Builders planning for Cylinder Assist® down the road

Specs

  • Sector Shaft: 45mm (stock is 35mm)
  • Gear Ratio: 16:1
  • Piston Size: 80mm
  • Ports: Metric O-ring (PSC includes adapters in kits if needed)
  • Case: Reinforced mounting pad and housing
  • Weight: ~57 lbs
  • Includes: PSC proprietary Pitman arm

What’s included

  • BIG BORE XD® Steering Gear (SG688)
  • PSC proprietary Pitman arm
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