GM TRUCKS 20914789 Rear Drive Shaft Double Box 6.0 8FT

( Brand: Gm Trucks ), ( Manufacturer Part Number: 20914789 ), ( Type: Driveshaft ), ( Placement On Vehicle: Rear ), ( Transmission Type: Automatic ), ( Id: B0c8e1d1-8881-4dd9-b777-c525d797ea50 ), ( Interchange: 431-2672 )

Review GM TRUCKS Chevy 6.0 Rear Drive Shaft Double Cab 8ft Box fits SILVERADO 2500 4X4 2011–2019

The **GM 20914789 Rear Drive Shaft Assembly** for the **2011 2019 Chevrolet Silverado 2500HD 6.0L V8 4x4** is a high-performance, heavy-duty drivetrain component engineered to deliver unmatched durability and reliability in demanding off-road, towing, and heavy-duty applications. This **double 8-foot (96-inch) shaft** is a direct OEM replacement part, meticulously designed to match the factory specifications of the GM 6.0L Duramax V8 or Vortec V8 powertrains, ensuring seamless integration with the transfer case, axle, and suspension system. Constructed from premium-grade **chromoly steel tubing**, the shaft features a robust **spindle design** with precision-machined yokes and universal joints that minimize vibration, reduce wear, and extend the lifespan of the drivetrain components. The **double shaft configuration** enhances torque transfer efficiency, making it ideal for towing heavy loads, hauling rugged terrain, or navigating extreme off-road conditions where a single shaft might struggle. Each joint is treated with **high-performance lubricants** and reinforced with **sealed bearings** to resist dust, moisture, and debris, ensuring long-term performance even in the harshest environments. The **OEM part number 20914789** confirms its compatibility with the **2011 2019 Silverado 2500HD 4x4 models**, including those equipped with the **Duramax diesel or Vortec gas engine**, while the **rear-drive shaft** configuration ensures proper alignment with the rear axle and transfer case. Whether you're a fleet operator, a heavy-duty towing professional, or an off-road enthusiast, this drive shaft delivers the strength, precision, and reliability needed to keep your Silverado 2500HD running smoothly under the toughest conditions. Built to withstand the rigors of daily use, this component is a critical upgrade for maintaining optimal drivetrain performance and preventing costly failures.

### **Pros and Cons of Buying a Used 2011 2019 Chevrolet Silverado 2500HD 6.0L 4x4 with a Rear Drive Shaft and Double 8-Foot Box**

#### **Pros**

1. **Durability and Workhorse Capability**

The 2011 2019 Chevrolet Silverado 2500HD is a heavy-duty truck designed for towing, hauling, and off-road use. The 6.0L V8 engine (L56 or L5P, depending on model year) is known for its reliability when properly maintained, making it suitable for commercial, agricultural, or heavy-duty personal use. The 4x4 system provides better traction in rough terrain.

2. **High Towing and Payload Capacity**

The Silverado 2500HD is rated for **up to 12,000 13,000 lbs of towing** (with proper equipment) and **up to 6,000 lbs of payload**, making it ideal for large trailers, boats, or heavy loads. The double 8-foot box provides extra cargo space, which is useful for contractors, farmers, or those needing to transport long materials.

3. **Strong Resale Value (Compared to Competitors)**

While not as high as newer models, the Silverado 2500HD retains decent resale value, especially in the used market. The brand recognition and availability of parts help maintain its worth.

4. **Availability of Parts and Service**

GM has a vast dealer network, and the 6.0L engine is widely serviced. While some newer trucks have advanced diagnostics, the 6.0L is straightforward for mechanics to work on, reducing downtime.

5. **Off-Road and Utility Features**

The 4x4 system, heavy-duty suspension, and available off-road packages (depending on trim) make this truck capable for light off-roading, mudding, or snow driving. The extended cab and crew cab options provide better visibility and seating for multiple passengers.

6. **Proven Engine (When Maintained)**

The **L56 (2011 2013)** and **L5P (2014 2019)** 6.0L V8 engines are known for longevity if the oil is changed frequently (every **5,000 7,500 miles**) and other fluids are serviced. Many examples with **under 200,000 miles** can last well beyond that with proper care.

7. **Customization and Modification Potential**

The Silverado 2500HD is a popular platform for modifications, including lift kits, aftermarket suspension, exhaust upgrades, and bed extensions. The double box allows for creative cargo solutions.

8. **Lower Initial Cost Than New**

Buying used saves thousands compared to a new truck, allowing more budget for modifications or additional features.

---

#### **Cons**

1. **Reliability Issues with the 6.0L Engine (If Neglected)**

- **Oil consumption** is a common complaint, especially in the **L56 (pre-2014)**. Some engines burn oil excessively, requiring frequent top-offs or even a rebuild.

- **Rod bearing wear** can occur if oil changes are skipped. The **L5P (2014 )** improved slightly but still requires strict maintenance.

- **Timing chain stretch** can lead to engine knocking or failure if not addressed.

- **Head gasket failures** (though rare) can be expensive to repair.

2. **Transmission Problems (6-Speed Automatic)**

The **6L90 6-speed automatic** is generally reliable but can develop **slipping, rough shifting, or solenoid failures** over time. Some owners report issues with the **torque converter** or **valve body**.

3. **Fuel Economy is Poor**

The 6.0L V8 averages **12 15 MPG highway** and **9 12 MPG city**, making it expensive to operate compared to diesel or turbocharged engines.

4. **Aging Technology and Comfort**

- **Infotainment system** (if equipped) is outdated by modern standards (no Apple CarPlay/Android Auto in most years).

- **Interior materials** can feel cheap compared to newer trucks.

- **Ride quality** is firm due to the heavy-duty suspension, which may not be comfortable for daily driving.

5. **Safety Features Lack Behind Modern Standards**

- **No standard backup camera** (common in newer trucks).

- **Limited advanced driver aids** (adaptive cruise, lane-keep assist, etc.).

- **Crash test ratings** are not as high as newer models (though the Silverado 2500HD is still safe by older standards).

6. **Potential for Rust (Especially in Snowy Climates)**

The **frame, wheel wells, and undercarriage** can rust if the truck was not properly winterized. A thorough inspection is crucial.

7. **Higher Maintenance Costs Than Smaller Trucks**

- **Tires, brakes, and suspension components** wear faster due to weight.

- **Fuel injectors** can clog over time, requiring cleaning or replacement.

- **Exhaust manifolds** may crack, leading to leaks.

8. **Recall and Unresolved Issues**

- **Fuel pump failures** (2011 2013).

- **Airbag deployment issues** (2014 2016).

- **Transmission fluid leaks** (2017 2019).

Always check **GM s recall database** before purchasing.

9. **Resale Depreciation**

While it holds value better than some trucks, the **2500HD still loses value faster than newer models**, especially if it has high mileage or major repairs.

10. **Potential for Hidden Damage**

- **Frame damage** (from accidents or off-roading).

- **Transfer case issues** (especially in 4x4 models).

- **Drive shaft wear** (critical in this case ensure it s inspected).

- **Bed and box welds** (double boxes can have stress points).

---

### **Key Considerations Before Buying**

1. **Mileage Matters**

- **Under 150,000 miles** Likely reliable if well-maintained.

- **150,000 200,000 miles** May need **oil changes, timing chain inspection, and transmission service**.

- **Over 200,000 miles** Expect **higher maintenance costs**, especially if oil changes were irregular.

2. **Maintenance Records Are Critical**

- **Oil change history** (must be **every 5,000 7,500 miles**).

- **Transmission fluid changes** (every **30,000 60,000 miles**).

- **Coolant, power steering, and brake fluid flushes**.

- **Timing chain inspection** (especially after **100,000 miles**).

3. **Drive Shaft and Rear Axle Inspection**

- **No leaks** in the drive shaft yokes or universal joints.

- **No excessive play or vibration** (could indicate worn bearings).

- **Axle seals** are intact (prevents grease leaks and contamination).

- **Differential fluid** is clean and at proper levels.

4. **Test Drive and Road Check**

- Listen for **knocks, whines, or unusual noises** (could indicate rod bearing wear or timing chain issues).

- Check for **smooth shifting** (no hesitation or jerking in the transmission).

- Test **4x4 engagement** (should engage smoothly without grinding).

- **Brake pedal feel** (should be firm, not spongy).

5. **Bed and Frame Condition**

- Look for **rust, dents, or welds** in the frame or bed.

- Ensure the **double box is structurally sound** (no warping or weak welds).

6. **Price Negotiation**

- **$10,000 $15,000** High mileage (200K ), needs work.

- **$15,000 $22,000** **150K 200K miles, well-maintained**.

- **$22,000 $30,000 ** **Low mileage (under 150K), clean title, full service records**.

- **Avoid "too good to be true" deals** could indicate hidden problems.

7. **Alternative Options to Consider**

- **Ford F-250 Super Duty (7.3L Power Stroke Diesel)** More fuel-efficient, better towing, but higher maintenance.

- **Ram 2500 (Hemi V8 or Cummins Diesel)** Smoother ride,

Details:

Vehicle Stock #: 6978. Part Stock #. Condition: 149k. Model: CHEVY SILVERADO 2500.

part #: 20914789 prices

• $1016.41-$1464.45

specifications universajoin:

• for models: 2500, 4x4, Silverado
• for makes: Chevy
• for years: 2011-2019
• brand: Gm Trucks
• mpn: 20914789
• type: Driveshaft
• placement on vehicle: Rear
• transmission type: Automatic
• id: B0c8e1d1-8881-4dd9-b777-c525d797ea50
• interchange: 431-2672

shipping universajoin:

• class: Standard
• service: Standard
• cost: $0.00
• transit: 2-6 Days
• type: Fixed

returns universajoin:

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

payments universajoin:

• other
• wallet: Google-pay
• credit card: Visa

general universajoin:

• Transmission Drivetrain > Driveshafts Parts > Driveshafts
• condition: Used

offer universajoin:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 1
• best offers: True
• started: February 24, 2026

seller universajoin:

• rating: 99.9%
• # reviews: 1797
• city: Mapleton, Illinois

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