Product Description
The PSC SG688 Big Bore XD2 Steering Gearbox is the ultimate steering upgrade for 2007-2018 Jeep Wrangler JK owners running oversized tires, hydraulic assist, or heavy off-road suspension systems. Built by PSC Steering Components, the XD2 Big Bore gearbox features an upgraded piston design that dramatically increases hydraulic force output, allowing your Jeep to steer larger tires with less effort while improving steering control on the trail and highway. The XD2 gearbox is engineered specifically for high-load steering applications including rock crawling, overlanding builds, and Jeeps running 35-40 inch tires. With PSC’s proven big-bore piston technology, the SG688 increases hydraulic assist capability and reduces steering fatigue compared to factory JK steering boxes. PSC machines each gearbox with precision internal components and reinforced housings to deliver durability in extreme off-road environments. Whether you're installing full hydraulic assist or simply want dramatically improved steering power, the SG688 Big Bore XD2 gearbox is one of the most trusted upgrades in the Jeep performance steering market.
Fitment
- 2007 Jeep Wrangler JK
- 2008 Jeep Wrangler JK
- 2009 Jeep Wrangler JK
- 2010 Jeep Wrangler JK
- 2011 Jeep Wrangler JK
- 2012 Jeep Wrangler JK
- 2013 Jeep Wrangler JK
- 2014 Jeep Wrangler JK
- 2015 Jeep Wrangler JK
- 2016 Jeep Wrangler JK
- 2017 Jeep Wrangler JK
- 2018 Jeep Wrangler JK
Ideal for vehicles running oversized tires, hydraulic steering assist systems, heavy aftermarket bumpers, or extreme off-road suspension setups.
Specifications for PSC SG688
| Specification | Details |
|---|---|
| Manufacturer | PSC Steering Components |
| Part Number | SG688 |
| Steering Gear Type | Big Bore XD2 Steering Gearbox |
| Application | Hydraulic assist compatible |
| UPC | 687927173446 |
| GTIN | 687927173446 |
| Shipping Info | Calculated at checkout |
| Prop 65 | WARNING: Cancer and Reproductive Harm – https://www.P65Warnings.ca.gov |
Frequently Asked Questions
What makes the PSC SG688 Big Bore XD2 steering gearbox different from stock?
The SG688 uses PSC’s Big Bore piston design which increases hydraulic steering force, making it much easier to turn large tires and heavy off-road setups compared to the factory Jeep JK steering box.
Does the PSC SG688 support hydraulic steering assist?
Yes. The SG688 is designed to work perfectly with PSC hydraulic assist steering systems and is commonly used in off-road builds running steering cylinders.
What tire sizes benefit most from this steering gearbox?
This steering gearbox is ideal for Jeep JK vehicles running 35", 37", or 40" tires where the factory steering system struggles to maintain steering control.
Is this a direct bolt-in upgrade?
Yes. The PSC SG688 is designed as a direct replacement steering gearbox for 2007-2018 Jeep Wrangler JK models.
Do I need other PSC steering components to use this gearbox?
While it can work with the factory steering system, it performs best when paired with PSC pumps, hydraulic assist cylinders, and upgraded steering components.
