JEGS M01958 Auto Trans 889944285076 6L90

( Brand: Jegs ), ( Manufacturer Part Number: M01958 ), ( Part Type: Tran ), ( Country Of Origin: Usa ), ( UPC: 889944285076 )

Review JEGS Reman Auto Trans Chevrolet And Gmc fits SILVERADO SIERRA 2500 2012

The **2012 Chevrolet Silverado 1500 / GMC Sierra 1500 (M01958, 6L90 Auto Transmission)** is a robust and versatile full-size pickup truck engineered for both rugged performance and refined daily utility. Built on Chevrolet s durable **DuraCoat galvanized steel frame**, this model exemplifies the strength and reliability expected from GM s legendary truck lineup, making it an ideal choice for professionals, off-road enthusiasts, and those who demand a vehicle that can handle heavy loads with ease. The **6.0L V8 Vortec 6400 engine** delivers a commanding **360 horsepower and 401 lb-ft of torque**, ensuring strong towing capacity (up to **8,500 lbs with the proper equipment**) and the ability to haul substantial payloads perfect for construction, farming, or heavy-duty transportation. Paired with the **6L90 automatic transmission**, this powertrain offers smooth, responsive shifting while maintaining the truck s signature towing prowess, making it a favorite among fleet operators and overland adventurers alike.

Designed with a **classic full-size truck silhouette**, the 2012 Silverado/Sierra balances ruggedness with practicality, featuring a **5.3-foot cargo bed** that can be extended to **8.2 feet** when the tailgate is lowered, providing ample space for tools, equipment, or outdoor gear. The **standard 4.11 rear axle ratio** enhances off-road capability and climbing ability, while the **heavy-duty suspension** absorbs rough terrain with minimal wear, ensuring a stable ride whether you re navigating city streets or unpaved roads. Inside, the cabin is spacious and functional, with **power-adjustable front seats**, a **tilt-and-telescoping steering wheel**, and a **standard 4.2-inch LCD display** for fuel economy and trip information. Optional upgrades like **heated seats, a premium sound system, or a rearview camera** further enhance comfort and convenience, catering to both work and leisure needs.

Built with durability in mind, this truck features **corrosion-resistant components**, including **galvanized frame rails and underbody protection**, ensuring longevity even in harsh environments. The **standard 4-door crew cab configuration** provides seating for up to five passengers, while the **optional extended cab** offers even more rear legroom for passengers or cargo. With **standard 17-inch wheels** and available **off-road tires**, this truck is ready for light off-roading or everyday driving, though heavier off-road applications may require additional modifications. Whether used for work, recreation, or as a reliable daily driver, the **2012 Chevrolet Silverado 1500 / GMC Sierra 1500 (M01958, 6L90 Auto)** stands as a testament to GM s commitment to building trucks that are as tough as they are dependable proving that power, space, and practicality can coexist in one exceptional vehicle.

### **Pros and Cons of Buying a 2012 Chevrolet Silverado/GMC Sierra 2500 HD (M01958, 6L90 Auto Transmission)**

#### **Pros**

1. **Reliability of the 6.6L Duramax Diesel Engine (6L90)**

- The 6L90 is a robust, turbocharged diesel engine known for its durability, especially in heavy-duty applications like towing and hauling. With proper maintenance, it can easily exceed 300,000 miles.

- Strong torque output (360 400 lb-ft, depending on year) makes it well-suited for heavy loads, making it ideal for work trucks, towing trailers, or off-road use.

- The **6L90** is less prone to common diesel issues (like fuel injectors or turbo failures) compared to earlier Duramax engines (e.g., 6.6L LLY), though it still requires regular maintenance.

2. **Proven 6L90 Transmission (6L90 Auto)**

- The **6-speed Allison automatic transmission** paired with the 6L90 is a well-matched combination, offering smooth shifting and good durability when maintained.

- Unlike some older transmissions, this setup is less likely to suffer from severe failure if fluids are changed regularly (every 60,000 100,000 miles).

3. **Strong Resale Value**

- The Silverado/Sierra 2500 HD with the Duramax 6L90 holds its value better than many other diesel trucks, especially in work-oriented markets.

- The **M01958** chassis (used in 2012 2013) is a solid platform with a robust frame and suspension, which helps maintain value over time.

4. **Towing and Hauling Capability**

- The 2012 model can tow **up to 12,000 14,000 lbs** (depending on configuration) and haul heavy payloads, making it excellent for construction, farming, or recreational use.

- The **heavy-duty suspension** and **braking system** are designed for demanding workloads.

5. **Availability of Parts and Service**

- As a GM diesel truck, parts are widely available, and mechanics familiar with Duramax engines are common.

- The **6L90** is a mature engine with a large owner community, meaning troubleshooting and repairs are easier than with newer or less common engines.

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

- While not as efficient as modern diesels, the 6L90 still offers **better fuel economy than a gas V8** (around **12 16 MPG highway** in a properly maintained truck).

- Diesel fuel provides better cold-weather performance and longer engine life compared to gasoline engines.

7. **Durability of the Chassis and Body**

- The **M01958** chassis is built to last, with a strong frame and heavy-duty components.

- The **cab-over-engine (COE) or crew cab options** provide good visibility and comfort for long drives.

---

#### **Cons**

1. **Maintenance Requirements**

- **Fuel filter changes** (every 10,000 15,000 miles).

- **DPF (Diesel Particulate Filter) and EGR (Exhaust Gas Recirculation) cleaning** (every 60,000 100,000 miles; clogged DPF/EGR can cause major issues).

- **Turbocharger inspection** (worn turbos can lead to oil leaks or loss of power).

- **Transmission fluid changes** (critical for longevity; Allison transmissions fail without proper fluid care).

- **Oil changes must be done with high-quality diesel oil** (e.g., 15W-40 or 5W-40) at recommended intervals (every 5,000 7,500 miles for severe use).

2. **Potential DPF and EGR Issues**

- The **DPF (Diesel Particulate Filter)** can clog over time, especially if the truck is used for short trips or low-speed driving. A clogged DPF requires regeneration (cleaning) or replacement, which can be expensive.

- The **EGR system** (which reduces emissions) can fail or become clogged, leading to rough idling, loss of power, or check engine lights. Cleaning or replacing EGR coolers is often necessary.

3. **Transmission Wear Over Time**

- **Slipping gears** (often due to low transmission fluid or worn clutches).

- **Delayed engagement** (can indicate solenoid or valve body failure).

- **Transmission fluid leaks** (from seals or gaskets).

- If the transmission fluid has never been changed or was neglected, the transmission may need a **full rebuild**, which can cost **$3,000 $5,000**.

4. **Noise and Vibration**

- The **6L90 is louder than a gasoline V8**, especially at highway speeds. Some owners report noticeable engine noise and vibration, particularly if the exhaust or intake is worn.

- The **turbocharger whine** can be audible under acceleration.

5. **Cold Weather Startup Issues**

- Diesel engines can be **difficult to start in cold temperatures** (below 32 F/0 C). A **block heater** is highly recommended for winter use.

- **Fuel gelling** (in very cold climates) can clog filters, requiring fuel additives.

6. **Higher Upfront Cost and Running Expenses**

- Diesel trucks are **more expensive to purchase** than comparable gasoline models.

- **Fuel costs** are higher than gasoline, though the truck may still be more efficient than a gas V8.

- **Repairs can be costly** if major components (turbo, injectors, transmission) fail.

7. **Emissions and Modern Compliance**

- The **2012 model is not equipped with the latest emissions technology** (e.g., SCR systems, which were introduced in later Duramax engines). This means:

- **No urea (DEF) requirement** (unlike newer diesels), which simplifies maintenance but also means the truck may not meet future emissions standards.

- **Potential issues with modern diagnostic tools** (some newer scan tools may not fully support older emissions systems).

8. **Rust and Body Wear**

- The **2012 model is not immune to rust**, especially in snowy or salted regions. Check the **wheel wells, frame rails, and undercarriage** for corrosion.

- **Exterior wear** (dents, paint chipping) is common in work trucks, so inspect the body for structural damage.

---

### **Key Considerations Before Purchase**

1. **Service History**

- Oil changes (type of oil used).

- Fuel filter replacements.

- DPF/EGR cleaning or replacement.

- Transmission fluid changes.

- **Avoid trucks with no service records** diesel engines and transmissions are forgiving if maintained, but neglect leads to catastrophic failure.

2. **Engine and Transmission Health**

- **Listen for unusual noises** (knocking, whining, grinding) under acceleration or at idle.

- **Check for smoke** (blue smoke oil burning; white smoke coolant leak; black smoke fuel-rich mixture).

- **Test drive for smooth shifting** jerky or delayed transmission response indicates trouble.

- **Inspect the turbocharger** for oil leaks or excessive play.

3. **DPF and EGR Condition**

- **A clogged DPF will cause the truck to limp or shut off.** A pre-purchase DPF clean or replacement may be needed.

- **EGR coolers can fail**, leading to overheating or rough idle. Listen for rattling or check for leaks.

4. **Transmission Fluid Condition**

- **Old, dark, or burnt-smelling fluid** indicates neglect. The fluid should be **reddish-brown and slightly metallic** (not black or gritty).

- **Check for leaks** around the transmission pan and cooler lines.

5. **Frame and Suspension**

- **Inspect the frame rails for rust or cracks** (critical for safety).

- **Check bushings, shocks, and sway bars** for wear or leaks.

- **Test the brakes** diesel trucks with heavy loads require strong braking systems.

6. **Electrical System**

- **Test all lights, gauges, and electronics** (especially the **check engine light** a persistent light indicates emissions or engine issues).

- **Battery health** is crucial for cold starts.

7. **Towing and Hauling Test**

- **If possible, test tow a trailer** to ensure the transmission and brakes handle the load.

- **Check for excessive heat in the exhaust** (can indicate turbo or injector issues).

---

### **Conclusion and Recommendation**

#### **Who Should Buy This Truck?

Details:

part #: m01958 prices

• $329.99-$5284.98

specifications autotransmissionsgo:

• for models: 2500, Silverado, Sierra
• for makes: Chevrolet, Gmc
• for years: 2012
• brand: Jegs
• mpn: M01958
• part type: Tran
• country of origin: Usa
• upc: 889944285076

returns autotransmissionsgo:

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

shipping autotransmissionsgo:

• type: Fixed
• transit: 5-10 Days
• cost: $0.00
• class: Standard
• service: Standard

offer autotransmissionsgo:

• started: May 23, 2026
• quantity: 1
• sold: 0
• options: Ship-to-home
• availability: In Stock

general autotransmissionsgo:

• Car Truck Parts Accessories > Transmission Drivetrain > Automatic Transmission
• condition: New

seller autotransmissionsgo:

• rating: 99.5%
• city: , Ohio
• # reviews: 631582

payments autotransmissionsgo:

• other
• credit card: Visa
• wallet: Paypal

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