GMC TRUCK SIERRA350 Rear Seat 215.GM9P21

( Brand: Gmc Truck ), ( Manufacturer Part Number: SIERRA350 ), ( Part Type: Seat ), ( Conditions Options: Crew, Blk Int, Clo ), ( Genuine Oem: Yes ), ( Ipn: 215.gm9p21 ), ( Descriptionpartcondition: Must Ship To Business/commercial Address With Forklift Or Loading ), ( Material: Cloth ), ( Placement On Vehicle: Rear )

Review GMC TRUCK Rear Seat Assembly Black Cloth Cab fits SIERRA CREW 3500 2021

The **GMC Sierra 3500HD 2024 (215.gm9p21) with the Rear Seat Crew Cab configuration** is a robust and versatile heavy-duty truck designed to deliver unmatched power, durability, and practicality for those who demand both performance and space. Built on the latest **Duramax 6.6L Turbo Diesel V8 engine**, this model produces a staggering **470 horsepower and 975 lb-ft of torque**, ensuring effortless towing and hauling capabilities that can handle everything from large trailers and heavy loads to demanding off-road adventures. The **Duramax engine** is paired with an **8-speed automatic transmission**, providing smooth, responsive shifting that maximizes efficiency while maintaining the truck s formidable strength.

The **Rear Seat Crew Cab** body style offers a spacious and comfortable interior, featuring a **four-door layout with a bench seat in the rear**, providing seating for up to five passengers ideal for families, work crews, or frequent travelers. The **rear seat area** is thoughtfully designed with ample legroom and headroom, ensuring comfort for passengers during long drives, while the **cargo area behind the rear seats** provides additional storage flexibility. The **high-roof design** further enhances headroom, making it easier for taller individuals to enter and exit the cab, while the **wide, ergonomic seating** is upholstered in durable, easy-to-clean materials that withstand daily wear.

Under the hood, the **2024 Sierra 3500HD** is equipped with **GMC s advanced technology and safety features**, including **Trailer Tailgating Assist**, which helps prevent rear-end collisions when backing up with a trailer, and **Adaptive Cruise Control** for smoother highway driving. The **360-degree camera system** enhances visibility around the truck, making it easier to navigate tight spaces, while the **available **SuperCruise** hands-free driving system** provides an added layer of convenience for long-distance travel. Inside, the **infotainment system** features a **12.3-inch touchscreen** with **Apple CarPlay and Android Auto**, wireless charging, and **GMC s intuitive Uconnect interface**, ensuring seamless connectivity and entertainment options.

For those who require serious towing and payload capacity, the **Sierra 3500HD** is engineered to deliver, with a **gross vehicle weight rating (GVWR) of up to 12,000 pounds** and a **maximum towing capacity of 22,000 pounds** when properly equipped. The **integrated trailer brake controller, heavy-duty cooling system, and reinforced frame** ensure that the truck remains stable and reliable even under the most demanding conditions. The **available **Max Trailering Package** further enhances off-road and towing performance with features like **adaptive air suspension, off-road tires, and a skid plate**, making it a formidable choice for adventurers and professionals alike.

Externally, the **2024 Sierra 3500HD** boasts a **bold, aggressive stance** with a **low-profile design, LED lighting, and available **Rearview Camera System**, improving both aesthetics and functionality. The **available **Denali trim** elevates the truck with premium finishes, including **stainless steel accents, premium upholstery, and a sunroof**, while the **available **Duramax Diesel Engine with **Selectable Off-Road Mode** ensures that the truck can tackle rough terrain with ease. Whether used for work, recreation, or daily driving, the **GMC Sierra 3500HD Rear Seat Crew Cab** combines **unmatched power, comfort, and versatility**, making it a standout choice for those who need a truck that can handle anything life throws at it.

### **Pros and Cons of Buying a 2021 GMC Sierra 3500HD (Rear Seat Crew Cab, VIN: 1G9PX215G9P21)**

#### **Pros**

1. **Strong Engine and Towing Capacity**

The 2021 GMC Sierra 3500HD is powered by a **6.6L Duramax diesel V8** (in most trims) or a **7.3L Duramax diesel V8** (in some configurations), delivering **470 500 horsepower and 975 1,050 lb-ft of torque**. This makes it one of the most capable heavy-duty trucks for towing (up to **14,000 lbs with the proper setup**) and hauling. The diesel engine also offers excellent fuel efficiency for its class, averaging **12 15 MPG combined** when properly loaded.

2. **Durability and Reliability**

The Duramax diesel engines are known for their longevity, often lasting **300,000 miles** with proper maintenance. The **8-speed automatic transmission** (in most models) is smooth and well-suited for heavy loads. The **rear-wheel-drive (RWD) configuration** (with optional 4WD) provides strong traction for towing and off-road use.

3. **Spacious and Functional Interior**

The **crew cab** offers a comfortable rear seating area (though not as large as a double cab), making it practical for occasional passengers. The **high roof** provides extra headroom, and the **available **360-degree camera** improves visibility when backing up. The **infotainment system** (with a **10.25-inch touchscreen**) is user-friendly, though some buyers prefer aftermarket upgrades for better connectivity.

4. **Strong Safety Features**

- **Forward Collision Alert with Automatic Emergency Braking**

- **Blind Spot Monitoring with Cross-Traffic Alert**

- **Lane Keep Assist**

- **Adaptive Cruise Control**

- **Rear Park Assist**

These features enhance safety, especially when driving a large truck in heavy traffic.

5. **Comfortable Ride and Refined Interior**

Despite its heavy-duty nature, the Sierra 3500HD has a **well-damped suspension** that absorbs road imperfections better than many competitors. The **available **heated front seats, ventilated seats, and a premium audio system** (with **16 speakers**) improve comfort for long drives. The **steering wheel and gear shifter** are well-placed, making it easy to handle.

6. **Good Resale Value**

GMC s heavy-duty trucks hold their value well compared to some competitors. The Duramax diesel engines also retain value better than gasoline-powered alternatives.

7. **Available Off-Road and Work Capabilities**

- **Available **4WD with **Locking Rear Differential** for better off-road traction.

- **Available **Off-Road Package** with **skid plates, all-terrain tires, and a higher lift** for serious off-roaders.

- **Heavy-duty suspension** can be upgraded with **air suspension or coilovers** for better load handling.

8. **Fuel Efficiency for a Heavy-Duty Truck**

While not as efficient as a diesel SUV, the **Duramax V8 still outperforms gasoline V8s** in the towing and hauling department. With proper maintenance, it can achieve **better than average MPG** for its class.

---

#### **Cons**

1. **High Purchase Price**

The 2021 GMC Sierra 3500HD is **expensive**, especially in well-equipped trims. Even a **base model starts around $50,000**, and fully loaded versions can exceed **$70,000**. This makes it a significant investment compared to smaller trucks or SUVs.

2. **Diesel Engine Maintenance Costs**

- **DPF (Diesel Particulate Filter) regeneration** (every **800 1,000 miles** if driven short distances).

- **EGR cooler replacement** (common failure point, often needing replacement by **100,000 150,000 miles**).

- **Turbocharger and fuel injectors** can also be expensive to repair.

- **Diesel exhaust fluid (DEF)** is required for emissions compliance, adding to fueling costs.

3. **Rear Seat Space Limitations**

The **crew cab rear seats are narrow and not ideal for adults** they are more suited for **children or occasional passengers**. If you frequently carry passengers, a **double cab** might be a better choice.

4. **Fuel Economy is Still Poor for Daily Driving**

Even with a diesel, the **Sierra 3500HD averages around 12 15 MPG combined**, making it **expensive to drive for daily commuting**. If you mostly drive short distances, a **gasoline-powered truck or SUV** might be more practical.

5. **Towing and Hauling Add Weight, Reducing MPG**

The more you tow or haul, the **worse the fuel economy becomes**. Some owners report **as low as 8 10 MPG** when fully loaded.

6. **Resale Depreciation Over Time**

While Duramax trucks hold value well, **heavy-duty trucks still depreciate faster than luxury cars or smaller trucks**. If you plan to sell it in **5 7 years**, you may not recover as much as you invested.

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

Finding **specialized mechanics** for Duramax engines can be difficult outside major cities. Some dealerships charge **premium labor rates** for diesel repairs.

8. **Noise and Vibration at Higher Speeds**

The **V8 diesel can be loud and vibrate more than a smaller engine**, especially on highways. The **cab insulation is decent, but not as refined as a luxury truck**.

9. **Some Electronic Glitches Reported**

A few owners have reported **infotainment system freezes, sensor malfunctions, and minor electrical issues**, though these are not widespread.

10. **Not Ideal for Urban Driving**

The **large size, high ground clearance, and limited visibility** make it **difficult to maneuver in tight city streets**. Parking can also be challenging.

---

### **Conclusion**

The **2021 GMC Sierra 3500HD (Rear Seat Crew Cab)** is an **excellent choice** if you need a **heavy-duty truck for towing, hauling, or off-road use** and can justify the **high upfront cost and maintenance requirements**. Its **Duramax diesel engine, towing capacity, and durability** make it one of the best in its class for work and adventure.

However, if you **primarily drive in the city, need frequent passenger space, or want better fuel efficiency**, a **smaller truck, SUV, or even a gasoline-powered heavy-duty model** might be a more practical (and cost-effective) alternative.

### **Recommendation**

You **regularly tow heavy loads (trailers, boats, RVs)** or haul large equipment.

You **need a durable, long-lasting work truck** and can afford diesel maintenance.

You **occasionally use off-road or rough terrain** and want a capable vehicle.

You **don t mind higher fuel costs** in exchange for power and towing ability.

You **mostly drive short distances** and want better fuel economy.

You **frequently carry passengers** and need a more spacious cab.

You **can t afford diesel maintenance costs** (DPF, EGR, turbo repairs).

You **prefer a more refined, quieter ride** (e.g., a Ram 3500 or Ford F-250 with a turbo diesel).

For the right buyer someone who **values towing power, durability, and off-road capability** the **2021 GMC Sierra 3500HD is a fantastic purchase**. However, **budget-conscious buyers or those who prioritize daily drivability** should explore other options. Always **get a pre-purchase inspection** to check for **DPF, EGR, and transmission issues** before buying.

Details:

No expedited shipping is available.

specifications seainterio:

• for models: 3500, Sierra, Crew
• for makes: Gmc
• for years: 2021
• brand: Gmc Truck
• mpn: Sierra350
• part type: Seat
• conditions options: Crew, Blk Int, Clo
• genuine oem: Yes
• ipn: 215.gm9p21
• descriptionpartcondition: Must Ship To Business/commercial Address With Forklift Or Loading
• material: Cloth
• placement on vehicle: Rear

offer seainterio:

• best offers: True
• started: May 28, 2026
• options: Ship-to-home
• quantity: 1
• availability: In Stock
• sold: 0

payments seainterio:

• other
• credit card: Discover
• wallet: Paypal

seller seainterio:

• rating: 99.9%
• city: Richland, Mississippi
• # reviews: 66185

shipping seainterio:

• type: Fixed
• cost: $450.00
• class: Freight
• service: Flat Rate Freight

general seainterio:

• condition: Used
• Interior Parts Accessories > Seats, Parts Accessories > Seats

returns seainterio:

• policy: Returns Accepted
• paid by: Buyer
• time: 30 Days

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