XD Steering Gear Box with Cylinder Assist Ports

Features:

• Fits 1999–2006 GM 2500HD/3500HD 4WD trucks
• XD Series built for heavy-duty applications
• Includes cylinder assist ports for future upgrades
• 45mm sector shaft for increased strength
• Larger internal components for greater durability
• Reinforced roller bearing prevents shaft deflection
• Reduces common OEM steering box failures
• Handles larger tires and heavier loads with ease
• Improves steering precision and on-road control
• Ideal for off-road, towing, and lifted builds
• Designed to eliminate lower oil seal failure
• Bolt-in upgrade for factory steering gearbox

Say Goodbye To Sloppy Steering And Hello To Control

If you’re tired of vague, loose steering in your GM HD truck, the PSC SG039R XD Steering Gear Box is the upgrade you’ve been waiting for. Built specifically for 1999–2006 Silverado and Sierra 2500HD/3500HD 4WD models, this box transforms how your truck feels behind the wheel. Whether you’re cruising down the highway or crawling over rocky trails, you’ll notice tighter steering and better feedback almost instantly. It’s built with the strength to handle oversized tires and heavy-duty use, making it a must-have for lifted setups or anyone who tows regularly. The oversized 45mm sector shaft and improved roller bearing eliminate the deflection and sloppy feel that plague stock units. This means no more second guessing your inputs or fighting the wheel on rough roads. Backed by PSC's reputation for quality and performance, this steering gear box is ready to restore the control and confidence your truck should have had from the start.

Engineered To Eliminate Play And Handle The Load

The PSC SG039R XD Steering Gear Box is designed to address one of the most notorious weak points in the 1999–2006 GM 2500HD/3500HD 4WD platform, the factory steering box. This XD model features a massive 45mm sector shaft supported by a precision roller bearing that minimizes shaft deflection under load, helping to prevent premature seal failure and internal wear. Larger sector shaft teeth and reinforced internal components increase torque handling and long-term durability, particularly in trucks running oversized tires or cylinder assist systems. Cylinder assist ports are pre-machined into the casting, making it easy to upgrade your steering setup later without needing to replace the box again. The result is a steering system that feels solid under stress and responds accurately to driver input, both on and off the pavement. Installation is straightforward, with a bolt-on design that replaces the stock unit directly. For anyone serious about control, strength, and longevity, this PSC upgrade is built to take abuse and keep you pointed exactly where you want to go.

Fits: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 GM Silverado/Sierra 2500HD/3500HD 4WD

Notes:

• Fits 1999–2006 GM Silverado/Sierra 2500HD and 3500HD 4WD models
• Designed specifically for use with 6-lug or 8-lug trucks equipped with solid front axles
• Replaces the factory steering gear prone to failure and steering play
• Equipped with cylinder assist ports for future hydraulic assist upgrades
• 45mm sector shaft provides increased strength and steering precision
• Improved internal roller bearing reduces shaft deflection and seal wear
• Larger sector shaft teeth support greater torque loads
• Ideal for vehicles with oversized tires, lift kits, or off-road use
• Prevents common issues like lower oil seal failure and steering wander
• Direct bolt-in replacement for factory steering gear box
• Recommended for trucks that experience steering stress under heavy load