Product Description
The PSC SK688R38JP1-6.75W-1.5OS Cylinder Assist Steering Kit is the ultimate steering upgrade for serious off-road Jeep builds. Designed specifically for the 2007-2011 Jeep Wrangler JK/JKU with the 3.8L engine, this PSC Big Bore XD steering system provides dramatically improved steering power, durability, and precision for vehicles running large tires, locking differentials, and heavy aftermarket axles. Built for extreme off-road use, this system integrates PSC’s legendary Big Bore XD steering gearbox, a high-performance power steering pump kit with remote reservoir, and a hydraulic assist steering cylinder engineered to handle the extreme loads generated by tires up to 44 inches. The included 6.75-inch stroke cylinder and 1.5" offset tie rod clamp are optimized for weld-on installations on aftermarket front axles such as Dynatrac, Teraflex, G2 Core, or Ultimate 60 setups. PSC engineered this kit to eliminate steering play, reduce pump overheating, and dramatically increase turning power in the harshest terrain. Whether your Jeep is crawling rocks, climbing steep trails, or running oversized tires, the SK688R38JP1 kit delivers unmatched control and reliability.
Fitment
- 2007 Jeep Wrangler JK 3.8L
- 2008 Jeep Wrangler JK 3.8L
- 2009 Jeep Wrangler JK 3.8L
- 2010 Jeep Wrangler JK 3.8L
- 2011 Jeep Wrangler JK 3.8L
- 2007-2011 Jeep Wrangler JK Unlimited (JKU) 3.8L
- Vehicles with aftermarket front axles (D44 Dynatrac, Teraflex, G2 Core 44, Ultimate 60)
- Designed for weld-on hydraulic assist steering installations
- Ideal for vehicles running tires larger than 35 inches
Specifications for psc SK688R38JP1-6.75W-1.5OS
| Specification | Details |
|---|---|
| Manufacturer | PSC Motorsports |
| Part Number | SK688R38JP1-6.75W-1.5OS |
| UPC | 687927188471 |
| GTIN | 687927188471 |
| Steering System Type | Hydraulic Cylinder Assist Steering Kit |
| Cylinder Stroke | 6.75 Inches |
| Tie Rod Clamp Size | 1.5 Inch Offset Bore |
| Mounting Style | Weld-On Assist Tabs |
| Steering Gear Included | PSC Big Bore XD Steering Gear |
| Pump Kit | High Performance Pump with Remote Reservoir |
| Shipping Info | Ships via Ground Carrier — Oversize Steering Kit Package |
| Prop 65 | WARNING: Cancer and Reproductive Harm – https://www.P65Warnings.ca.gov |
Frequently Asked Questions
What does a cylinder assist steering kit do?
A hydraulic cylinder assist steering kit adds an external steering ram that works with the steering gearbox to provide additional turning force. This dramatically reduces steering effort and stress on steering components when running large tires or locking differentials.
Why upgrade to PSC Big Bore XD steering?
PSC’s Big Bore XD steering gearbox increases piston size and steering torque output, giving Jeep JK owners stronger steering control and eliminating common issues like pump overheating and steering play.
Is this kit designed for stock axles?
This configuration is designed for weld-on installation on aftermarket axles with a 6.75-inch lock-to-lock steering setup such as Dynatrac or Teraflex Dana 44 or Ultimate 60 axles.
Does the kit include everything needed for installation?
Yes. The PSC steering kit includes the Big Bore XD steering gearbox, hydraulic steering cylinder, pump kit with reservoir, fluid cooler, hoses, fittings, hardware, and steering fluid required for installation.
How large of tires can this steering system support?
PSC designed this system for Jeeps running aggressive off-road setups including locking differentials and tires up to approximately 44 inches in diameter.
