Does the A-Premium Power Steering Gearbox Assembly fit a 2015 GMC Sierra 3500 HD?

Yes, the A-Premium Power Steering Gearbox Assembly fits a 2015 GMC Sierra 3500 HD because the vehicle’s fitment data confirms compatibility for the 3500 HD models produced between 2011 and 2015.

The Power Steering Gear Box for Silverado Sierra 2500 features an input shaft diameter of 0.79 in with a Metric thread type, matching the requirements for these heavy-duty trucks. We selected this unit for our comparison because it specifically lists the 3500 HD as a compatible fitment. Because steering components are mechanical linkages, ensuring the input shaft diameter and spline count are identical is critical to prevent the steering wheel from failing to connect to the box. This specific gearbox provides a 3.5 total turns lock-to-lock and utilizes M18 x 1.5 and M16 x 1.5 pressure and return port threads. While the 3500 HD is a heavier chassis, the 2500-spec gear is listed as compatible; however, you should verify if your specific truck requires a different internal gear ratio to handle the extra weight. We do not have data on whether your vehicle’s electronic power steering (EPS) system requires a software flash or calibration after a mechanical box replacement, so you should consult your service manual for digital recalibration requirements.

What to Check Before Buying the Power Steering Gear Box for Silverado Sierra 2500

Before ordering this steering gear—the heavy metal housing that translates your steering wheel turns into wheel movement—you must confirm these specific details to ensure a successful installation.

• Confirm your truck’s steering column uses a 0.79 in input shaft diameter and a Metric thread.
• Verify that your 3500 HD model does not utilize a unique frame bracket or bolt pattern that differs from the 2500 HD.
• Check if the unit includes high-pressure lines and seals or if you need to source additional plumbing.
• Confirm if your specific 3500 HD configuration requires a specialized gear ratio for heavy-duty weight distribution.
• Consult a professional installer to determine the specific torque specifications for the mounting bolts to avoid steering play.

Comparing the Power Steering Gear Box for Silverado Sierra 2500

The Power Steering Gear Box for Silverado Sierra 2500 is a standard replacement option for owners seeking to restore factory steering feel. If you are looking for a remanufactured unit with a certified warranty, you may want to look at reman options instead of this new assembly. Buyers who prioritize a specific internal gear ratio for extreme heavy-duty towing might also consider specialized heavy-duty gearboxes that differ from the standard 2500/3500 shared fitment. For most owners, this unit provides the necessary specs to replace a failing steering box on a 2015 Sierra 3500 HD.

A buyer who needs a new, direct-fit replacement for a 2011-2015 GMC Sierra 3500 HD should choose this product for its verified fitment and standard metric specifications.

Power Steering Gear Box for Silverado Sierra 2500

4.3/5 from 5 buyer ratings

$288 price checked August 2026

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