Power Steering Gear Box for Silverado Sierra 2500
$288 price checked August 2026
If you need a new unit for a 2011-2022 Silverado or Sierra 2500 HD, this is the one.
Power Steering Gear Box for Silverado Sierra 2500 Overview
The Power Steering Gear Box for Silverado Sierra 2500 is for owners needing a precise steering feel and fits trucks with a 0.79 in input shaft diameter, providing a reliable Silverado 2500 HD Power Steering Gear Box replacement.
Smooth, predictable steering allows for safer operation of a heavy-duty truck, especially when navigating complex paths or hauling heavy loads. A high-quality gear box ensures that the connection between the steering wheel and the tires remains tight and responsive.
The Power Steering Gear Box for Silverado Sierra 2500 delivers this responsiveness by utilizing a 1.63 in output shaft diameter and M18 x 1.5 pressure port threading. These specifications ensure the unit integrates with your existing hydraulic lines and steering components.
Our comparison of the car gearbox options we evaluated led us to select this unit based on its specific fitment for 2011-2021 Silverado 3500 HD models. This review is for truck owners who require a replacement that meets the 0.79 in input shaft standard.
How ExtremeSpec Auto picked: we started from the 23 most-reviewed car gearbox listings in our retail dataset, removed duplicates, accessories and off-category products, and 4 qualified. This product is one of 3 from that pool chosen for a full review. Our scores blend buyer satisfaction (60%), price position against comparable products (25%) and rating volume (15%). Specifications come from manufacturer listings and ratings from verified Amazon buyer reviews (data checked August 2026).
The Short Answer on the Power Steering Gear Box for Silverado Sierra 2500
Best for: you need a direct replacement for a Silverado or Sierra 2500 HD steering unit that matches the 0.79 in input shaft diameter.
This Power Steering Gear Box for Silverado Sierra 2500 is the recommended choice at $288.
- Pro: The 0.79 in input shaft diameter matches the specific requirements for 2011-2022 HD models.
- Pro: It features a 3.5 total turns lock to lock ratio for predictable steering travel.
- Pro: The pressure port uses an M18 x 1.5 thread size for standard hose compatibility.
- Con: The 0.79 in input shaft diameter rules out use on lighter-duty trucks with different shaft specs.
- Con: The 1.63 in output shaft diameter limits fitment to specific 2500/3500 HD configurations.
Don’t buy this if: your vehicle is a right-hand drive model or requires a different input shaft than 0.79 in.
Price assessment: The $288 price point is fair for a new unit with these specific heavy-duty dimensions.
ExtremeSpec Auto score: 7.7/10 (data-driven – see “How we picked” above)
Specifications in Full
| Condition | New |
| Input Shaft Diameter | 0.79 in |
| Output Shaft Diameter | 1.63 in |
| Pressure Port Thread Size | M18 x 1.5 |
| Return Port Thread Size | M16 x 1.5 |
| Total Turns Lock To Lock | 3.5 |
| Input Shaft Spline Quantity | 0 |
| Reference Numbers | 27-7675, 277675, 1426, 19256662, 19257732, 19330691, 22845815, 22923379, 23130417, 23453443 |
The 0.79 in input shaft diameter and Metric thread sizes (M18 x 1.5 and M16 x 1.5) are the primary specifications for ensuring this unit matches your steering column and hydraulic lines.
Before You Buy: Power Steering Gear Box for Silverado Sierra 2500 Checklist
The first thing to check is whether your truck is equipped with the NV8 transmission, as this gearbox is not compatible with that specific configuration.
- ☐ Confirm your truck is a Left Hand Drive model — For Left Hand Drive Only
- ☐ Verify the input shaft diameter matches your steering column — 0.79 in
- ☐ Match the pressure port thread size — M18 x 1.5
- ☐ Match the return port thread size — M16 x 1.5
- ☐ Check the output shaft diameter — 1.63 in
- ☐ Confirm the total turns lock to lock matches your steering travel — 3.5
You should not buy this product if your vehicle uses an NV8 transmission or if your existing steering linkage requires a custom shaft length to align with the 0.79 in input diameter.
What These Specifications Let You Do
3.5 Total Turns Lock To Lock
The Power Steering Gear Box for Silverado Sierra 2500 provides 3.5 total turns lock to lock. This specific turn count ensures that you maintain the steering ratio intended for heavy-duty trucks, providing the necessary leverage to turn the wheels without excessive effort.
Because this unit matches the standard rotation count for these models, you can expect a steering feel that aligns with the original factory unit. The 3.5 turns provide the same smooth weight and predictable resistance as an OEM component during low-speed maneuvering.
M18 x 1.5 Pressure Port Threading
Pressure port threading on the Power Steering Gear Box for Silverado Sierra 2500 uses the M18 x 1.5 standard. This specific thread size ensures that your high-pressure hydraulic lines will seat correctly and maintain a secure seal under heavy load.
Matching the M18 x 1.5 thread prevents the risk of a housing bolt pattern deviation or a thread mismatch that could cause leaks. You can rely on this standard to maintain consistent hydraulic pressure throughout the steering system.
Left Hand Drive Compatibility
Left Hand Drive compatibility is a fixed requirement for the Power Steering Gear Box for Silverado Sierra 2500. This means the internal geometry and mounting points are specifically configured for vehicles where the steering wheel is on the left side of the cabin.
Power Steering Gear Box for Silverado Sierra 2500 is designed for specific Chevrolet and GMC fitments. You must confirm your vehicle is a left-hand drive model before ordering, as the internal gear layout is not reversible for right-hand drive configurations.
How the Power Steering Gear Box for Silverado Sierra 2500 Compares to Alternatives
The Power Steering Gear Box for Silverado Sierra 2500 provides a significant cost advantage over high-end alternatives, priced at $288 compared to the $548.99 Polaris Steering Gearbox Assembly 1824923.
- The Power Steering Gear Box for Silverado Sierra 2500 has a 4.3 rating, which is higher than the 3.7 rating of the Detroit Axle Front Gear Box Kit Jeep Wrangler.
- This unit costs $147.41 more than the TXT Medalist Golf Cart Steering Gearbox Assembly.
- The Power Steering Gear Box for Silverado Sierra 2500 costs $260.99 less than the Polaris Steering Gearbox Assembly 1824923.
The Power Steering Gear Box for Silverado Sierra 2500 is a new casting, which offers different reliability profiles than remanufactured units. Because the data does not specify a remanufactured certification, you should verify the specific warranty terms provided by the seller before purchasing.
If you require a steering gearbox for a golf cart rather than a heavy-duty truck, the TXT Medalist Golf Cart Steering Gearbox Assembly is the appropriate choice for your application.
Power Steering Gear Box for Silverado Sierra 2500 Buying Questions Answered
Is it worth spending $288 on this instead of just rebuilding my old one?
You should weigh the $288 price against the specific labor costs of a professional rebuild for your vehicle. While a rebuild may save on parts, a new Power Steering Gear Box for Silverado Sierra 2500 provides a fresh start for the internal components and seals.
Does it come with the seals and mounting hardware included?
The provided specifications do not list seals or mounting hardware as included components in this gearbox assembly. You should confirm the exact contents of the package with the seller before ordering to ensure you have the necessary hardware for the installation.
Will the Power Steering Gear Box for Silverado Sierra 2500 fit my 2011 Silverado 2500 HD?
Yes, this unit is compatible with the Chevrolet Silverado 2500 HD 2011-2015 and 2021 models. The 0.79 in input shaft diameter and Metric thread type match the requirements for these specific years.
Does the Power Steering Gear Box for Silverado Sierra 2500 work for Left Hand Drive vehicles?
Yes, the manufacturer specifies that this gearbox is designed for Left Hand Drive vehicles only. This ensures the internal geometry of the gear box matches your steering column configuration.
You can confirm if the A-Premium gearbox fits a 2015 GMC Sierra 3500 HD by viewing our specific compatibility guide.
Determining the correct fitment is easier when you learn how to choose gearbox thread types for your specific vehicle.
Is the Power Steering Gear Box for Silverado Sierra 2500 Right for You?
The Power Steering Gear Box for Silverado Sierra 2500 suits 5 kinds of buyer and is the wrong choice for 3 jobs, listed below with the reason for each.
Who the Power Steering Gear Box for Silverado Sierra 2500 is for, and what it does well
Who the Power Steering Gear Box for Silverado Sierra 2500 suits
- Owner-operators of heavy-duty delivery trucks — the specific fitment for Silverado 2500/3500 HD models ensures reliable steering for heavy loads
- Fleet maintenance technicians — the multiple reference numbers (27-7675, 19256662, etc.) allow for easy cross-referencing during repairs
- Owner-operators of 2011-2015 Chevrolet trucks — the specific vehicle fitment ensures compatibility with older heavy-duty models
- Rural ranch owners — the 3.5 total turns lock-to-lock provides the necessary steering ratio for maneuvering large trucks in tight spaces
- Independent auto mechanics — the new condition and standard metric thread types make it a reliable replacement part for workshop repairs
What the Power Steering Gear Box for Silverado Sierra 2500 handles well
- Heavy-duty towing and hauling — the 1.63 in output shaft diameter provides the necessary torque for 2500/3500 HD trucks
- Standard steering rack replacement — the 0.79 in input shaft diameter matches the standard requirements for these specific truck models
- Left-hand drive vehicle repair — the specific fitment for LHD vehicles ensures correct orientation for the steering geometry
- Hydraulic steering system maintenance — the M18 x 1.5 and M16 x 1.5 pressure and return ports allow for standard fluid line connections
- Fleet vehicle restoration — the new condition ensures a reliable component for trucks with high-mileage steering systems
What the Power Steering Gear Box for Silverado Sierra 2500 is the wrong choice for
- Right-hand drive truck conversions — the specific fitment for Left Hand Drive Only makes it unusable for RHD configurations
- NV8 drivetrain configurations — the fitment notes explicitly exclude vehicles with NV8, making it incompatible for those specific setups
- Custom steering setups requiring splined inputs — the 0 input shaft spline quantity rules out custom builds requiring a splined connection
What to budget alongside the Power Steering Gear Box for Silverado Sierra 2500, and what to skip
Worth buying at the same time
- Power steering fluid — required to fill the pressure and return ports
- Mounting hardware — needed to secure the gearbox to the vehicle chassis
- Steering rack boots — required to protect the internal components from debris
- Tie rod ends — necessary to connect the output shaft to the wheels
- Power steering pump — required to provide the hydraulic pressure to the M18 x 1.5 port
What you can skip
- Input shaft adapter — the 0.79 in diameter is the standard size for this application
- Metric thread adapters — the M18 x 1.5 and M16 x 1.5 ports are already standard metric threads
Where to Buy the Power Steering Gear Box for Silverado Sierra 2500
These retailers sell Car Gearbox generally – we do not track which of them has this particular model in stock, so check availability and the current price with the retailer before making a trip.
- Advance Auto Parts (online and physical stores) — local availability and in-store returns
- Amazon (online only) — broad selection of aftermarket and OEM brands
- RockAuto (online only) — extensive catalog of specialized and budget parts
- Summit Racing Equipment (online and physical stores) — specialist performance and heavy-duty components
- eBay (online only) — wide variety of refurbished and specialty components
- AutoZone (online and physical stores) — local availability and in-store returns
- O’Reilly Auto Parts (online and physical stores) — local availability and in-store returns
Final Verdict on the Power Steering Gear Box for Silverado Sierra 2500
If you need a replacement power steering gear box for a 2011-2022 Chevrolet Silverado or Sierra 2500/3500 HD (excluding NV8 models) and require a left-hand drive configuration, the Power Steering Gear Box for Silverado Sierra 2500 is the correct choice at around $288.
The 0.79 in input shaft diameter and M18 x 1.5 pressure port thread size ensure this unit matches the specific mechanical requirements of these heavy-duty trucks. This gearbox also maintains a 4.3 rating from 5 buyers.
Skip it if: your truck is equipped with an NV8 transmission or if you require a right-hand drive configuration.
Where to go next in our Car Gearbox coverage
- Which Steering Gearbox Assembly Is Best for Polaris?
- Best Replacement Power Steering Gearbox Assembly for Jeep Wrangler TJ
- Heavy Duty Steering Gearbox Assemblies for Chevrolet Silverado 2500 3500 HD Compared
- Choosing the Best Golf Cart Steering Gearbox Assembly for Smooth Handling
- The Power Steering Gear Boxes That Work Best for GMC Sierra 2500 3500 HD