CHEVROLET 455671332 Transmission 400-11143 72K

( Part Type: Transmission ), ( Ipn: 400-11143 ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 6 Month ), ( Warranty Length: 6 Month Warranty ), ( Vehicle Transmission Type: Auto ), ( Oe/oem Part Number: 24286981 )

Review CHEVROLET Colorado Transmission Oem 72k Miles fits 2020

The **Chevrolet 400-11143 2020 Transmission (Part Number: 455671332)** is a high-performance, heavy-duty automatic transmission designed specifically for select Chevrolet and GMC full-size trucks, SUVs, and performance-oriented vehicles from the 2020 model year. Part of General Motors advanced **6L90E** transmission family, this unit is engineered to deliver exceptional durability, smooth shifting, and robust torque handling, making it an ideal choice for drivers seeking both reliability and performance in demanding applications. Built with precision-crafted internal components, including a reinforced planetary gear set, a durable torque converter, and a robust valve body, this transmission is engineered to withstand the rigors of towing heavy loads, hauling payloads, or pushing high-performance engines to their limits. The **6L90E** architecture incorporates a **6-speed automatic** configuration, featuring sequential gear ratios that optimize efficiency and acceleration, whether navigating city streets or cruising on the highway. Its advanced hydraulic and electronic controls ensure precise shift quality, reducing lag and enhancing responsiveness, while the robust construction minimizes wear and tear over time. This transmission is particularly well-suited for applications in the **Chevrolet Silverado 2500HD/3500HD**, **GMC Sierra 2500HD/3500HD**, and other heavy-duty trucks equipped with powerful V8 engines, such as the **L5P** or **L5V** configurations. Whether used in a brand-new vehicle or as a high-quality replacement for a worn-out unit, this transmission embodies GM s commitment to engineering resilience and performance, ensuring that it can handle the most demanding driving conditions with ease. Proper installation, fluid maintenance, and adherence to GM s service recommendations will further extend its lifespan, making it a dependable choice for both fleet operators and enthusiasts alike.

**Pros and Cons of buying a Chevrolet 400 (Part Number 11143) 2020 Transmission (Part Number 455671332)**

1. **Compatibility with GM Vehicles** This is a genuine OEM transmission for several Chevrolet, GMC, and Cadillac models from the 2014 2020 model years, including the Silverado, Tahoe, Suburban, and Escalade. It is a direct replacement for the 6-speed automatic transmission found in these trucks and SUVs, ensuring proper fitment and functionality.

2. **Reliability and Durability** As an OEM part, it is built to meet GM s stringent quality standards. The 400-series transmission is known for its robustness, especially in heavy-duty applications like towing and hauling. Many owners report smooth shifting and long-term reliability when properly maintained.

3. **Warranty Coverage** Purchasing from a reputable dealer or authorized GM service center may include a warranty, often covering manufacturing defects for a set period (e.g., 1 3 years or 36,000 72,000 miles). This provides peace of mind against premature failure.

4. **Performance Optimization** For vehicles with high mileage or those used for heavy-duty tasks, replacing a worn-out transmission with this OEM unit can restore performance, prevent further damage, and extend the lifespan of the drivetrain.

5. **Aftermarket Support** Since this is a widely used transmission, there is a strong aftermarket presence for fluids, filters, gaskets, and repair parts. This makes maintenance and repairs more accessible and cost-effective in the long run.

6. **Resale Value** Installing an OEM transmission can enhance the resale value of a vehicle, as buyers prefer vehicles with known, reliable components.

7. **Compatibility with Upgrades** If you plan to modify your vehicle (e.g., performance tuning, heavy-duty suspension, or towing packages), this transmission is designed to handle such upgrades without excessive stress.

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1. **High Cost** OEM transmissions are significantly more expensive than aftermarket or rebuilt units. The 2020 Chevrolet 400 transmission can cost between **$3,500 and $6,000 **, depending on the source, labor costs, and additional services required (e.g., torque converter replacement, fluid flush, or programming).

2. **Labor-Intensive Installation** Replacing a transmission is a complex job that typically requires **10 15 hours of labor** in a shop. DIY installation is not recommended due to the complexity of fluid lines, electrical connections, and torque converter installation. Labor costs can add **$1,500 $3,000** or more to the total expense.

3. **Potential for Hidden Issues** Even OEM transmissions can have pre-existing issues if the original unit was failing or if the vehicle was not maintained properly. A thorough inspection (including a transmission fluid analysis, solenoid testing, and valve body diagnostics) is crucial to avoid surprises.

4. **Limited Availability and Lead Times** OEM transmissions may not always be in stock, especially for older model years. Purchasing from a dealer or authorized GM parts supplier could result in longer wait times or higher prices due to demand.

5. **Compatibility Concerns with Modified Vehicles** If your vehicle has been heavily modified (e.g., forced induction, custom drivetrains, or non-GM components), the OEM transmission may not be fully optimized for those changes. In such cases, a specialized transmission or tuning may be required.

6. **Potential for Overkill** If your vehicle is not used for heavy-duty tasks (e.g., towing 10,000 lbs regularly), the OEM transmission may be more robust than necessary, leading to unnecessary costs without significant benefits.

7. **Warranty Limitations** While OEM warranties are robust, they may not cover all types of damage (e.g., wear-and-tear, improper installation, or misuse). Always review the warranty terms carefully before purchasing.

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The **2020 Chevrolet 400 (Part Number 11143) transmission (Part Number 455671332)** is a high-quality, reliable option for restoring or upgrading a GM heavy-duty truck or SUV. It offers superior compatibility, durability, and performance, making it ideal for vehicles used in demanding applications like towing, hauling, or off-roading. However, the **high upfront cost, labor-intensive installation, and potential for hidden issues** must be carefully considered.

If your vehicle is experiencing transmission failure and you prioritize **long-term reliability and peace of mind**, this OEM transmission is a strong choice especially if you have the budget and access to professional installation. For budget-conscious buyers or those with less demanding driving needs, a **rebuilt or aftermarket transmission** (from a reputable brand like **Mopar, ACDelco, or BorgWarner**) may offer a more cost-effective alternative without sacrificing too much performance.

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- **Proceed with the OEM Chevrolet 400 transmission** from an **authorized GM dealer or service center**. Ensure the transmission is inspected for pre-existing issues, and have the installation done by a **GM-certified technician**.

- **Budget for the full cost**, including labor, fluid changes, and potential additional components (e.g., torque converter, seals).

- **Consider extended warranty coverage** if available to protect your investment.

- **Explore rebuilt or aftermarket transmissions** (e.g., ACDelco 4L85-E, Mopar 6-speed, or BorgWarner) that are compatible with your vehicle. These options can be **30 50% cheaper** while still offering good reliability.

- **Get a transmission fluid analysis** before purchasing to confirm the root cause of failure (e.g., internal wear vs. external issues like torque converter failure).

- **Compare quotes from multiple shops** to ensure you re getting fair pricing for labor and parts.

- **Have a professional diagnose the issue** before committing to a replacement. Sometimes, a **transmission rebuild or repair** (rather than a full replacement) may be sufficient and more cost-effective.

- **Check for recalls or service bulletins** related to your specific transmission model, as GM may have addressed certain issues in newer units.

Ultimately, the **OEM Chevrolet 400 transmission is the best choice for those who want the most reliable, long-lasting solution** for their GM vehicle, but it requires careful financial planning and professional installation. For others, a **balanced approach** (e.g., rebuilt OEM or high-quality aftermarket) may provide the best value.

Details:

Warranty does NOT cover labor, diagnostics, towing, rental car, or any other expense related to an item being defective/damaged. This will ensure the cooling system is flowing. They will not have any packaging included. Fill the transmission with OEM recommended fluids.

Clear all transmission computer codes in the vehicle prior to starting or operating. Remove torque converter strap. Someone over 18 must be present for delivery. Replace the radiator or cooler if recommended by manufacturer.

Inspect and replace rear seal as needed. Warranty does NOT cover labor, diagnostic, towing or rental car costs. To aid in installation, you get to keep your current transmission and all attached accessories. Remove all 'cap-plugs' from lines and orifices.

Replace front seal. Properly install and index the torque converter completely into front pump. Residential Address - Load is curbside delivery ONLY. Change over sensors as needed.

Flush the transmission cooler lines and radiator with a power flush machine or an aerosol 'Cooler Kit. Most 4WD some 2WD vehicles must re-learn the shift logic to transmission after installation. Transfer cases are not included with transmission from AWD vehicles. Verify the differential portion of transmission is full fluid.

ATTENTION: This listing is for 1 Transmission ONLY, Warranty covers the transmission case, torque converter included automatic transmissions only and all internal components. In certain types of Transmissions the TCM transmission controlling computer is incorporated with Valve body which may require valve to be replaced.

part #: 455671332 prices

• $634.93-$1595.00

specifications autotransmissionsgo:

• for makes: Chevrolet
• for years: 2020
• part type: Transmission
• ipn: 400-11143
• genuine oem: Yes
• manufacturer warranty: 6 Month
• warranty length: 6 Month Warranty
• vehicle transmission type: Auto
• oe/oem part number: 24286981

payments autotransmissionsgo:

• credit card: Diners-club
• wallet: Paypal
• other

offer autotransmissionsgo:

• quantity: 1
• sold: 0
• options: Ship-to-home
• started: May 13, 2026
• availability: In Stock

seller autotransmissionsgo:

• # reviews: 508189
• rating: 98.7%
• city: Manchester, Tennessee

general autotransmissionsgo:

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

returns autotransmissionsgo:

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

shipping autotransmissionsgo:

• cost: $0.00
• type: Fixed
• service: Flat Rate Freight
• class: Freight

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