Product Description
PSC Big Bore XD Steering Gear (Wrangler JK 2007-2018)
The stock JK steering box? It’s fine for stock tires and errands. But throw on 37s, a locker, and a weekend in Moab, and that thing’s begging for mercy. The BIG BORE XD® is the fix—built with a beefy 45mm sector shaft and a reinforced case so it won’t twist, crack, or cry when you crank it hard. Pair it with a PSC High-Flow Pump Kit and you’ll feel the difference the first time you turn the wheel—smooth, strong, and no more arm wrestling at the trailhead.
Kit Includes:
- BIG BORE XD Steering Gear (SG688)
- PSC proprietary pitman arm
- 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
Notes:
** 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 MFGFront 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.
