Product Description
Upgrade the weak factory steering system in your heavy-duty GM truck with the PSC SG039 BIG BORE XD Power Steering Gearbox. Designed specifically for 1999.5-2006 GM 2500HD and 3500HD 4WD trucks, this PSC XD steering box is engineered to handle the increased loads created by larger tires, lifted suspensions, and aggressive off-road use. Unlike remanufactured steering gears, the SG039 is built with all-new internal components and PSC’s proven BIG BORE XD design to provide improved durability, steering response, and long-term reliability. The PSC BIG BORE XD steering gearbox solves the well-known steering issues found in GM HD trucks by incorporating a massive 45mm sector shaft, oversized internal gear teeth, and upgraded roller bearings that eliminate sector shaft deflection and seal failures. These improvements provide tighter steering feel, smoother operation, and the strength needed to support larger wheels and tires. Whether you're building a heavy towing rig, off-road Duramax truck, or lifted HD workhorse, the PSC SG039 delivers the steering control and durability serious truck owners demand.
Fitment
- 1999.5-2006 Chevrolet Silverado 2500HD 4WD
- 1999.5-2006 Chevrolet Silverado 3500 4WD
- 1999.5-2006 GMC Sierra 2500HD 4WD
- 1999.5-2006 GMC Sierra 3500 4WD
- 2001-2006 GM Duramax LB7, LLY, and LBZ platforms
- Requires PA806 4-Spline Pitman Arm
Specifications for PSC SG039
| Specification | Details |
|---|---|
| Manufacturer | PSC Steering Components |
| Part Number | SG039 |
| Sector Shaft | 45mm Heavy-Duty Shaft |
| Pitman Arm Requirement | 4-Spline (PA806 Required) |
| Condition | Brand New (Not Remanufactured) |
| UPC | 687927184794 |
| GTIN | 687927184794 |
| Shipping Info | Approximately 30 lbs – Calculated at Checkout |
| Prop 65 | WARNING: Cancer and Reproductive Harm – https://www.P65Warnings.ca.gov |
Frequently Asked Questions
What makes the PSC SG039 steering gearbox better than stock?
The SG039 features a larger 45mm sector shaft, stronger internal gear design, and upgraded bearings that eliminate the flex and seal failures common with factory GM steering boxes.
Is the PSC SG039 a remanufactured steering box?
No. The PSC SG039 is built using all-new components, ensuring better durability and performance compared to rebuilt or remanufactured units.
Do I need a new pitman arm when installing this steering box?
Yes. This steering gear requires a 4-spline pitman arm such as the PSC PA806.
Will this steering gearbox work with large tires or lifted trucks?
Yes. The BIG BORE XD design was specifically engineered to handle the increased steering loads caused by oversized tires and lifted suspension setups.
Can this steering box be used with hydraulic cylinder assist?
For hydraulic ram assist steering systems PSC offers the SG039R variant which includes ports for assist cylinder plumbing.
