GMC TRUCK SIERRA350 Seat Rear 215.GM9O18

( Brand: Gmc Truck ), ( Manufacturer Part Number: SIERRA350 ), ( Part Type: Seat ), ( Conditions Options: 4dr Pu Blk Lea ), ( Genuine Oem: Yes ), ( Ipn: 215.gm9o18 ), ( Manufacturer Warranty: No Warranty )

Review GMC TRUCK Seat Rear fits 2018

The **GMC 215.gm9o18 Sierra 350 (2018) Seat Rear** is a meticulously crafted, high-performance automotive component designed to deliver uncompromising comfort, durability, and ergonomic support for the rear seating area of the 2018 GMC Sierra 350, particularly in its robust **Denali, High Country, or SLE trim levels** where premium materials and refined interiors are standard. Engineered to accommodate up to three passengers with optimal spacing, this seat features a **contoured, high-density foam cushion** that cradles the body while maintaining structural integrity during aggressive driving maneuvers, long highway trips, or off-road excursions where the Sierra s legendary towing and hauling capabilities are put to the test. The **adjustable lumbar support** ensures proper spinal alignment, reducing fatigue during extended drives, while the **thick, plush upholstery** often finished in **leather, Alcantara, or premium synthetic materials** resists wear, stains, and fading, maintaining its luxurious appearance even after years of use. For enhanced functionality, the seat incorporates **easy-release headrests** that can be folded down for cargo flexibility, and in higher trims, may include **power-adjustable features** such as seat height, tilt, and even memory settings for personalized comfort. The **reinforced frame and mounting hardware** are engineered to withstand the Sierra s heavy-duty suspension and towing demands, ensuring stability and longevity even under extreme loads. Whether installed in a **crew cab or extended cab configuration**, this seat rear is a testament to GMC s commitment to blending rugged utility with refined passenger comfort, making it an ideal choice for adventurers, families, or professionals who demand both performance and sophistication from their vehicle s interior.

### **Pros and Cons of Buying a 2018 GMC Sierra 3500HD (GM9O18) with a Used Rear Seat**

#### **Pros**

1. **Strong Engine and Towing Capacity**

The 2018 GMC Sierra 3500HD comes with a **6.6L Duramax diesel V8**, which is one of the most reliable and powerful diesel engines available in heavy-duty trucks. It delivers **up to 470 lb-ft of torque**, making it capable of towing **up to 22,000 lbs** (with proper equipment) and hauling heavy loads with ease. This makes it ideal for commercial, agricultural, or heavy-duty personal use.

2. **Durability and Longevity**

The Duramax engine is known for its **robust construction and fuel efficiency**, often lasting **300,000 miles** with proper maintenance. The **diesel common-rail fuel system** and **turbocharging** ensure strong performance even under heavy loads. The truck s **heavy-duty frame, suspension, and drivetrain** are built to withstand tough conditions, making it a long-term investment.

3. **Fuel Efficiency for a Diesel Truck**

While not as efficient as modern diesel trucks, the 2018 Duramax still offers **better mileage than most gasoline-powered heavy-duty trucks**. In mixed driving, it averages **12-15 MPG highway**, which is decent for a truck of this size. Diesel fuel also provides **better energy density**, meaning fewer refueling stops over long distances.

4. **Strong Resale Value**

The Duramax engine holds its value well compared to gasoline engines, especially in the commercial and heavy-duty market. If you plan to sell it later, it will likely retain a higher resale price than a similar gasoline-powered truck.

5. **Comfortable Cab and Technology**

The **2018 Sierra 3500HD** comes with a **spacious, well-built cab** (available in **Sleep Cab or Crew Cab configurations**). It features **modern amenities** such as:

- **8-inch touchscreen infotainment** (with optional **Apple CarPlay and Android Auto** in higher trims)

- **Available wireless charging**

- **Heated/ventilated seats** (in higher trims)

- **Blind-spot monitoring and rear cross-traffic alert** (in some trims)

- **Available 12.3-inch digital gauge cluster**

The **rear seat** (if included) provides additional passenger space, which can be useful for occasional passengers or cargo flexibility.

6. **Reliability and Maintenance Costs (Compared to Gas Engines)**

While diesel engines require **more frequent maintenance** (e.g., **fuel filter changes, turbo inspections, and DPF/EGR cleaning**), they are **generally more reliable** than gasoline engines in extreme conditions. The **Duramax is less prone to catastrophic failure** than some gasoline V8s, especially in high-mileage applications. However, **parts and labor costs can be higher** than for a standard truck.

7. **Off-Road and Hauling Capabilities**

The **available **4x4 system** (with **locking rear differential** in some trims) and **heavy-duty suspension** make this truck capable of handling **off-road conditions, mud, snow, and rough terrain**. The **high ground clearance** and **strong braking system** (with **stabilizer bars and heavy-duty brakes**) enhance its utility.

8. **Available Off-Road and Work-Oriented Features**

- **Skid plates** (standard on some trims)

- **Heavy-duty cooling system** (for the Duramax)

- **Available **trailer brake controller** and **towing packages**

- **Optional **work lights** and **bed liners**

9. **Good for Commercial and Fleet Use**

If you're buying this for **business purposes** (e.g., construction, farming, moving, or delivery), the **Duramax s torque, reliability, and payload capacity** make it a **cost-effective choice** compared to gasoline trucks over time.

10. **Lower Operating Costs Over Time (If Maintained Properly)**

While **initial maintenance costs are higher**, the **fuel efficiency, longevity, and lower repair frequency** (compared to gasoline engines) can **reduce long-term operating costs**, especially for high-mileage drivers.

---

#### **Cons**

1. **Higher Upfront Cost**

A **2018 GMC Sierra 3500HD with a rear seat** (especially in a **Sleep Cab or Crew Cab**) will be **more expensive** than a comparable gasoline-powered truck. Even used, the **Duramax engine and heavy-duty components** command a premium price.

2. **Complex and Expensive Maintenance**

- **Diesel engines require more frequent servicing** than gasoline engines (e.g., **fuel filter changes every 10,000-15,000 miles**, **turbo inspections**, **DPF/EGR cleaning**).

- **Parts for the Duramax can be costly**, especially if you need **injectors, turbochargers, or transmission components**.

- **Labor costs for diesel repairs are often higher** than for gasoline engines.

- **Exhaust aftertreatment systems (DPF, SCR)** add complexity and potential failure points.

3. **Lower Fuel Economy Than Modern Diesels**

While still efficient for a diesel truck, the **2018 Duramax is less fuel-efficient** than newer **2021 Duramax engines** (which have **SCR systems and better turbocharging**). Expect **around 12-15 MPG highway**, which is **better than most gasoline trucks but worse than newer diesels**.

4. **Potential for DPF and EGR Issues**

- The **Diesel Particulate Filter (DPF)** can **clog over time**, requiring **regeneration cycles** (which may not always work properly).

- The **Exhaust Gas Recirculation (EGR) system** can **fail or get clogged**, leading to **rough idling, loss of power, or check engine lights**.

- These issues can be **expensive to repair** if not maintained properly.

5. **Rougher Ride Quality (Compared to Modern Trucks)**

- The **2018 Sierra 3500HD has a firmer suspension** compared to newer models with **adaptive damping systems**.

- The **cab can be noisy at highway speeds**, especially with the **Duramax s turbo lag** (though this improves with newer engines).

- **Seating comfort** varies some owners find the **bench seat in the Sleep Cab to be less supportive** than modern bucket seats.

6. **Transmission Limitations**

- The **6-speed automatic transmission** (in most models) is **reliable but not as smooth** as newer **8-speed or 10-speed transmissions**.

- Some owners report **rough shifting or delayed engagement**, though this is less common in well-maintained examples.

7. **Rear Seat May Not Be Practical for Daily Use**

- If you **rarely use the rear seat**, it may not be worth the extra cost.

- The **Sleep Cab configuration** (if chosen) is **better for long-haul drivers** but may not be ideal for daily commuters.

- The **rear bench seat is narrow and may not be comfortable** for adults for extended periods.

8. **Higher Insurance Costs**

- **Heavy-duty trucks, especially diesel models, tend to have higher insurance premiums** due to their **towing capacity, repair costs, and higher risk of theft**.

- If used for **commercial purposes**, insurance costs may increase further.

9. **Potential for Electrical Gremlins**

- **Faulty sensors**

- **Infotainment system glitches**

- **Starter or alternator failures**

- These issues can be **annoying and sometimes costly to fix**.

10. **Resale Depreciation (Compared to Newer Models)**

- While the **Duramax holds value well**, newer **2021 Sierra 3500HDs with updated engines and tech** will **depreciate less** over time.

- If you plan to **trade it in soon**, a newer model may be a better long-term investment.

11. **Diesel Fuel Availability and Costs**

- **Diesel fuel is often more expensive than gasoline** (though prices fluctuate).

- In some rural areas, **diesel stations may be less common**, making refueling less convenient.

- **Winter diesel (DF-2) may be required in cold climates**, adding extra cost.

12. **Potential for Transmission or Transfer Case Issues**

- Some **6-speed transmissions** in older Duramax trucks have reported **premature wear or failure**, especially if not maintained properly.

- The **transfer case (if 4x4) may require occasional fluid changes** and could fail if neglected.

---

### **Ending Conclusion**

The **2018 GMC Sierra 3500HD (GM9O18) with

Details:

It is the full seat assembly with bottom cushion, back and frame. Please see photos and utilize the zoom tool to check condition of part. It will NOT come with mounting bolts or seat belts.

part #: sierra350 prices

• $87.45-$236.20

specifications seainterio:

• for makes: Gmc
• for years: 2018
• brand: Gmc Truck
• mpn: Sierra350
• part type: Seat
• conditions options: 4dr Pu Blk Lea
• genuine oem: Yes
• ipn: 215.gm9o18
• manufacturer warranty: No Warranty

returns seainterio:

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

seller seainterio:

• city: Buffalo, Wyoming
• # reviews: 5979
• rating: 97.8%

payments seainterio:

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

shipping seainterio:

• service: Flat Rate Freight
• cost: $400.00
• type: Fixed
• class: Freight

general seainterio:

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

offer seainterio:

• started: May 16, 2026
• best offers: True
• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock

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