Product Description
Upgrade the steering performance of your heavy-duty Ram with the PSC SG856R Big Bore XD Cylinder Assist Steering Gearbox. Designed specifically for 2009-2014 Dodge Ram 2500 and 3500 trucks, this high-performance steering gearbox is engineered to provide increased steering control, improved durability, and the power required to handle oversized tires and aggressive off-road use. Built on PSC’s proprietary XD platform, the SG856R features a larger internal piston and an upgraded 45mm sector shaft support bearing to dramatically reduce sector shaft deflection. The result is tighter steering feel, improved reliability, and increased steering torque capacity when compared to factory gearboxes. The PSC SG856R is a direct-fit replacement steering gear that retains the factory pitman arm and OEM high- and low-pressure hoses while adding integrated -6AN ports for hydraulic steering assist cylinders. This makes it an ideal upgrade for trucks running large tires, locking differentials, or dedicated off-road steering assist systems. Whether you're building a dedicated rock crawler, towing heavy loads, or simply correcting loose factory steering, the PSC SG856R steering gearbox delivers superior steering precision and long-term durability for your Ram HD truck.
Fitment
- 2009 Dodge Ram 2500 / 3500
- 2010 Dodge Ram 2500 / 3500
- 2011 Ram 2500 / 3500
- 2012 Ram 2500 / 3500
- 2013 Ram 2500 / 3500
- 2014 Ram 2500 / 3500
- Compatible with 2WD and 4WD trucks
- Designed for trucks running hydraulic cylinder assist steering systems
Note: PSC SB400K and some aftermarket steering braces or stabilizer kits may not be compatible with this steering gearbox.
Specifications for PSC SG856R
| Specification | Details |
|---|---|
| Manufacturer | PSC Steering Components |
| Part Number | SG856R |
| UPC | 687927185913 |
| GTIN | 687927185913 |
| Steering Ratio | 13:1 Ratio |
| Turns Lock-to-Lock | 3.25 Turns |
| Sector Shaft | 45mm Heavy-Duty Sector Shaft Bearing |
| Cylinder Assist Ports | -6AN Male Ports |
| Input Shaft | 3/4-36 Spline |
| Mounting | 3 Bolt Inside Frame Mount |
| Shipping Info | Calculated at checkout |
| Prop 65 | WARNING: Cancer and Reproductive Harm – https://www.P65Warnings.ca.gov |
Frequently Asked Questions
What is the benefit of the PSC Big Bore XD steering gearbox?
The larger internal piston and upgraded 45mm sector shaft support bearing increase steering torque and eliminate sector shaft deflection, providing tighter steering control and better durability than factory gearboxes.
Does the PSC SG856R work with hydraulic steering assist?
Yes. The gearbox includes -6AN ports designed specifically for connecting PSC hydraulic steering assist cylinders.
Is this a direct bolt-in replacement for the factory steering box?
Yes. The SG856R is designed as a direct-fit replacement and works with factory pitman arms and OEM pressure and return hoses.
Will this help with steering problems caused by large tires?
Absolutely. The larger piston diameter and improved torque output make the SG856R ideal for trucks running oversized tires, heavy wheels, and locking differentials.
Can I run this gearbox without a steering assist cylinder?
This version is designed for cylinder assist steering systems. If your truck does not use hydraulic assist, PSC offers other steering gearboxes designed for standard steering setups.
