PSC Big Bore XD Steering Gear Boxes for Jeep (2007-18) Wrangler / (2018) Wrangler JK/JKU
SG688R
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 45 mm 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.
Pricing:
$1,450.99
Description
•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
Installation:
•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
•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
Installation:
•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
Details
- SG688R
- SG688R
- 687927184657
- PSC
- New
Shipping Information
- Item Requires Shipping
- 62.0 lbs.
- W15.0000” x H15.0000” x L24.0000”
- Free Shipping
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