GMC 84224694 Diesel Power Steering Rack Gear Box 551-2392 6.6L

( Manufacturer Part Number: 84224694 ), ( Part Type: Steering Rack Gear Box ), ( Condition And Options: Power Steering, W/magnetic Speed Variable Power ), ( Manufacturer Warranty: 90 Day ), ( Ipn: 551-2392 ), ( Placement On Vehicle: Front ), ( Bundle Description: Tie Rod Ends Inc ), ( Core Charge: No Core Charge ), ( Custom Bundle: Yes ), ( Fitment Type: Factory Oem Fitment ), ( Performance Part: Factory Oem Spec ), ( Oe Spec Or Performance/custom: Oem Factory Spec )

Review GMC 6.6l Diesel Power Steering Rack Gear Box Assembly Oem Factory Wty fits SIERRA 2500 2017–2019

The **GMC 84224694 Power Steering Rack and Gear Box Assembly** for the **2017 2019 Chevrolet/GMC Sierra 1500 with the 6.6L Duramax Diesel Engine** is a precision-engineered, high-performance component designed to deliver seamless, responsive steering control while maintaining durability under heavy loads and demanding conditions. This direct-replacement part is meticulously crafted to match the exact specifications of the factory unit, ensuring a perfect fit for the **Duramax 6.6L L5P engine configuration**, which powers these robust full-size trucks. The rack and gear box assembly features a robust **titanium nitride-coated rack shaft** for enhanced wear resistance and longevity, reducing the risk of premature failure even in extreme towing or off-road scenarios. The integrated **steering gear mechanism** incorporates a **recirculating ball design**, providing smooth, precise steering feedback with minimal effort, while the **sealed and lubricated internal components** ensure consistent performance without the need for frequent adjustments or maintenance. This assembly is engineered to withstand the high torque demands of the Duramax engine, offering reliable operation whether navigating tight city streets, hauling heavy payloads, or tackling rugged terrain. Built to meet or exceed OEM standards, this aftermarket replacement is backed by rigorous quality testing to guarantee compatibility with the truck s existing steering linkage, tie rods, and mounting hardware, eliminating the need for additional modifications. Whether used for daily driving, professional fleet applications, or off-road adventures, this power steering rack and gear box assembly delivers the durability, efficiency, and performance expected from a GMC Sierra ensuring a confident, smooth, and reliable steering experience for years to come.

### **Pros and Cons of Buying a GMC Sierra (2017 2019) with a 6.6L Duramax Diesel and Power Steering Rack (Part # 84224694)**

#### **Pros**

1. **Reliable Engine (6.6L Duramax Diesel)**

- The 6.6L Duramax is a well-regarded diesel engine known for its durability and strong towing capacity (up to 12,000 lbs in some trims).

- With proper maintenance, it can last well beyond 300,000 miles, making it a solid choice for heavy-duty use.

- Good fuel efficiency for a diesel truck, averaging around 15 20 MPG depending on load and driving conditions.

2. **High Towing and Hauling Capacity**

- The 6.6L Duramax is designed for heavy-duty applications, making it ideal for towing trailers, boats, or carrying large loads.

- The 2017 2019 models come with robust drivetrain components, including a heavy-duty transmission and suspension, which support high payloads.

3. **Strong Resale Value**

- Duramax-equipped GMC Sierras hold their value better than many gasoline-powered trucks, especially in the heavy-duty segment.

- The diesel market remains strong among commercial and off-road enthusiasts, which can help if you decide to sell later.

4. **Power Steering Rack (Part # 84224694) Availability**

- The power steering rack is a common replacement part, meaning it is widely available from aftermarket and OEM suppliers.

- Many mechanics and dealerships are familiar with Duramax-specific power steering systems, making repairs easier to diagnose and execute.

5. **Off-Road and Heavy-Duty Capabilities**

- The 6.6L Duramax is often paired with off-road packages (e.g., Z71), making it suitable for rugged terrain.

- The truck s frame and suspension are built to handle rough conditions, which is beneficial for farmers, contractors, or outdoor enthusiasts.

6. **Lower Operating Costs (Compared to Gas Engines)**

- Diesel fuel is generally cheaper per gallon than gasoline, and the engine s efficiency can reduce long-term fuel expenses.

- Duramax engines are known for longevity, which can offset higher upfront costs over time.

---

#### **Cons**

1. **Higher Upfront Cost**

- Diesel trucks, especially with the 6.6L Duramax, are more expensive to purchase than comparable gasoline models.

- Used examples may still carry a premium due to their reputation for reliability.

2. **Maintenance and Repair Costs**

- While the engine is durable, diesel-specific repairs (e.g., turbocharger, EGR system, DPF/DEF components) can be costly.

- The power steering rack (Part # 84224694) is not inherently problematic, but leaks or failure can occur, requiring replacement though parts are accessible.

- Some owners report issues with the **EGR cooler** or **DPF (Diesel Particulate Filter)**, which can lead to expensive repairs if neglected.

3. **DEF (Diesel Exhaust Fluid) Requirement**

- Modern Duramax engines require DEF, a urea-based fluid, to reduce emissions. This adds an ongoing cost and requires monitoring.

- Failure to use DEF can lead to engine damage or reduced performance.

4. **Potential for Common Duramax Issues**

- **EGR Cooler Failure:** A known issue in some Duramax models (though less common in 2017 2019 than earlier years) can cause coolant leaks and engine damage.

- **Turbocharger Wear:** High-mileage examples may show signs of turbocharger degradation, which can reduce power and efficiency.

- **Transmission Issues:** Some owners report rough shifting or failure in the 6-speed automatic transmission, though this is less common in the 6.6L Duramax than in earlier models.

5. **Limited Fuel Economy in Stop-and-Go Traffic**

- While diesel engines are efficient on highways, they struggle with fuel economy in city driving due to idling and frequent starts/stops.

- The 6.6L Duramax may average **12 15 MPG in urban areas**, which can be worse than some gasoline trucks in similar conditions.

6. **Resale Depreciation Over Time**

- While Duramax trucks hold value well, they do depreciate faster than luxury or premium gasoline trucks.

- If you plan to sell after a few years, the resale value may not fully recoup the initial investment.

7. **Noise and Vibration**

- Diesel engines, especially the 6.6L Duramax, can be louder and more vibration-prone than gasoline engines, which may be noticeable in a quiet cabin.

- The power steering rack itself is not typically noisy, but worn suspension or drivetrain components can contribute to a rough ride.

8. **Limited Availability of Parts and Mechanics**

- While Duramax parts are widely available, finding a specialist mechanic familiar with diesel systems may be harder in some areas.

- Some dealerships charge premium labor rates for diesel-specific repairs.

---

### **Ending Conclusion**

The **2017 2019 GMC Sierra with a 6.6L Duramax diesel and the specified power steering rack (Part # 84224694)** is an excellent choice for buyers who prioritize **towing capacity, durability, and fuel efficiency** over short-term operating costs. The engine is robust, the power steering system is reliable (with common replacement parts), and the truck is well-suited for heavy-duty, commercial, or off-road use.

However, potential buyers should be prepared for **higher upfront costs, ongoing DEF requirements, and potential maintenance expenses** (especially if the vehicle has high mileage or a history of neglect). Common Duramax issues like **EGR cooler failure or turbocharger wear** should be inspected before purchase, and a thorough pre-purchase inspection is strongly recommended.

If you plan to use the truck for **towing, hauling, or off-road adventures**, the trade-offs are justified. If you prioritize **lower operating costs and simplicity**, a gasoline-powered truck or a newer diesel model with fewer emissions-related concerns might be preferable.

---

### **Recommendation**

- You need a **high-towing, heavy-duty truck** for work or recreational use.

- You are willing to **budget for maintenance** (DEF, potential turbo/EGR repairs).

- You find a **well-maintained example** with **under 200,000 miles** and a **clean service history**.

- You can **inspect the power steering rack, EGR system, and turbocharger** before purchasing.

- You are looking for a **low-cost, low-maintenance vehicle** a gasoline truck may be more suitable.

- The truck has **high mileage (over 250,000 miles) without full service records**.

- You cannot afford **unexpected repairs** (e.g., EGR cooler replacement, turbo failure).

- You dislike **diesel-specific requirements** (DEF, occasional emissions-related issues).

This truck is a **strong, long-term investment** for the right buyer especially those in need of a reliable work or off-road vehicle. However, it requires **proactive maintenance and a realistic budget** for repairs. Always **get a pre-purchase inspection** and verify the service history before buying.

Details:

SIERRA 2500 PICKUP 2016 - 2016 Power Steering; w/magnetic speed variable assist power steering opt NV8. Specific information about the condition is found below. This part comes with a 90 day guarantee. SIERRA 2500 PICKUP 2017 - 2019 power steering, w/magnetic speed variable power steering opt NV8.

SPECIFIC PART NOTES: 6.6L ,EIV SFP041326 CML051226, There may be differences between steering/suspension options, drive lines, production dates, etc.

part #: 84224694 prices

• $200.00-$424.00

specifications steragebo:

• for models: 2500, Sierra
• for makes: Gmc
• for years: 2017-2019
• mpn: 84224694
• part type: Steering Rack Gear Box
• condition and options: Power Steering, W/magnetic Speed Variable Power
• manufacturer warranty: 90 Day
• ipn: 551-2392
• placement on vehicle: Front
• bundle description: Tie Rod Ends Inc
• core charge: No Core Charge
• custom bundle: Yes
• fitment type: Factory Oem Fitment
• performance part: Factory Oem Spec
• oe spec or performance/custom: Oem Factory Spec

offer steragebo:

• quantity: 1
• best offers: True
• started: June 1, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock

general steragebo:

• condition: Used
• Car Truck Parts Accessories > Steering Suspension > Gearboxes, Rack Pinions

payments steragebo:

• wallet: Google-pay
• other
• credit card: Diners-club

returns steragebo:

• policy: Returns Accepted
• paid by: Buyer
• time: 60 Days

seller steragebo:

• # reviews: 84468
• rating: 99.8%
• city: Pensacola, Florida

shipping steragebo:

• type: Fixed
• transit: 3-9 Days
• carrier: UPS
• cost: $0.00
• class: Standard
• service: UPS Ground

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