1. Automatic Transmissions Products
  2. sku: 23604957789192782
  3. AVALNCH15

AVALNCH15 Automatic Transmission 400-00297 6.0L

fits model: 1500, 2wd, Avalanche. year: 2007.

400-00297 Factory Oem Automatic Transmission 6.0l 2wd Fits 07 Avalanche 1500 2395428

( Brand: Factory Oem ), ( Manufacturer Part Number: AVALNCH15 ), ( Part Type: Transmission ), ( Conditions Options: A4sp Rwd ), ( Genuine Oem: Yes ), ( Ipn: 400-00297 ), ( Make: Chevrolet ), ( Manufacturer Warranty: 6 Month ), ( Partout Id: A-124736000 )

Review FACTORY OEM Automatic Transmission 6.0l fits AVALANCHE 1500 2WD 2007

The **400-00297 Automatic Transmission for a 2007 Chevrolet Avalanche 1500 with a 6.0L V8 Engine (2WD)** is a high-performance, factory-spec replacement transmission designed to restore optimal drivetrain function and reliability in your full-size pickup truck. Built to exacting GM specifications, this **4L60-E automatic transmission** is engineered to deliver seamless shifting, enhanced torque handling, and durable longevity, ensuring it meets the demanding requirements of both daily driving and occasional heavy-duty use. The transmission features a robust **6-speed gearset**, including a dedicated **overdrive ratio** for improved fuel efficiency and reduced engine strain during highway cruising, while the **torque converter** is precision-matched to the 6.0L Vortec V8 s power output, providing smooth acceleration and responsive performance. Constructed from high-grade steel and reinforced housing components, this transmission is engineered to withstand the stresses of towing, hauling, and aggressive driving conditions, making it an ideal upgrade for owners seeking a reliable, long-lasting drivetrain solution. Whether you re restoring a classic Avalanche or replacing a worn-out original unit, this transmission offers a seamless fit with the factory driveline, complete with compatible **input/output shafts, bellhousing, and fluid pump**, ensuring minimal installation complexity and maximum compatibility. Backed by the quality standards of OEM-grade components, it delivers the same level of performance and durability as the original equipment, allowing you to enjoy effortless shifting, reduced wear on connected drivetrain components, and an extended service life with proper maintenance. Ideal for both restoration projects and routine replacements, this transmission is a critical component for maintaining the power and reliability of your 2007 Avalanche s 6.0L V8 in 2WD applications.

### **Pros and Cons of Buying a 2007 GMC Avalanche 1500 (400-00297) with a 6.0L V8 and 400-00297 Automatic Transmission (4L60E/4L80E)**

#### **Pros**

1. **Strong Engine and Towing Capability** The 6.0L V8 (LQ9 or LQ4 engine) is a robust powerplant known for its durability and towing ability, capable of handling heavy loads with ease. This makes the Avalanche ideal for work or recreational towing.

2. **Reliable Automatic Transmission (4L60E/4L80E)** The 4-speed automatic transmission in this model is a proven design, widely used in GM trucks and known for longevity if properly maintained. Many examples with high mileage still run smoothly with basic upkeep.

3. **Full-Size Truck Platform** The Avalanche is built on the same frame as the Chevrolet Silverado and GMC Sierra, meaning it has a spacious cargo area, high ground clearance, and a sturdy build. The extended cab options provide extra seating for passengers.

4. **Off-Road and Utility Versatility** The 2WD configuration is suitable for everyday driving, but the Avalanche s size and frame also make it adaptable for light off-roading or utility work. Some owners add aftermarket lifts or suspension upgrades for better capability.

5. **Parts Availability and Aftermarket Support** As a GM full-size truck, parts are widely available, and the aftermarket offers numerous upgrades (engine swaps, suspension, exhaust, etc.). This makes repairs and modifications more accessible than on niche vehicles.

6. **Potential for Modifications** The 6.0L V8 is a popular platform for engine swaps (e.g., LS-based engines) or performance upgrades, allowing owners to increase power or improve reliability over time.

7. **Lower Purchase Price Compared to New Trucks** A 2007 Avalanche with this configuration will cost significantly less than a new truck, making it a budget-friendly option for those needing a heavy-duty vehicle.

8. **Proven Durability in Some Cases** Many 6.0L V8 trucks from this era, when maintained, can last well over 200,000 miles. Some examples have been known to run reliably with basic maintenance.

---

#### **Cons**

1. **High Mileage and Wear Concerns** Many 2007 Avalanches with this transmission and engine configuration will have high mileage (150,000 miles). This increases the risk of wear on the transmission, engine mounts, suspension, and drivetrain components.

2. **Transmission Issues (4L60E/4L80E)** While the 4-speed automatic is durable, it is prone to common failures such as:

- **Valve body failure** (leading to rough shifting or complete transmission failure).

- **Torque converter issues** (slipping or not engaging properly).

- **Solenoid failures** (causing erratic shifting or no shifting at all).

- **Fluid leaks** (from the pan gasket or cooler lines).

Proper maintenance (fluid changes every 30,000 50,000 miles) is critical, but many owners neglect this, leading to premature failure.

3. **Engine Reliability Concerns** The 6.0L V8 (LQ9/LQ4) is known for:

- **Rod bearing failures** (especially if oil changes were neglected).

- **Camshaft wear** (leading to oil consumption or ticking noises).

- **Head gasket leaks** (common in high-mileage examples).

- **Water pump failures** (can cause overheating if not addressed).

A pre-purchase inspection is **essential** to check for these issues.

4. **Fuel Economy** The 6.0L V8 is not fuel-efficient, averaging around **12 14 MPG combined**. This can be costly for daily driving, especially with high fuel prices.

5. **Rust and Body Issues** Many older GM trucks from this era suffer from rust, particularly in the wheel wells, frame rails, and undercarriage. A thorough inspection of the body and frame is necessary to avoid costly repairs.

6. **Electrical Problems** GM trucks from the late 2000s are notorious for electrical gremlins, including:

- Faulty sensors (mass airflow, oxygen sensors).

- Check engine lights (often due to minor issues like vacuum leaks).

- Infotainment or climate control failures.

These can be frustrating and expensive to diagnose.

7. **Safety and Modern Standards** The Avalanche lacks modern safety features such as:

- Electronic stability control (though some later models had it).

- Advanced airbag systems.

- Modern driver-assistance technologies (blind-spot monitoring, lane-keeping).

- Poor crash test ratings compared to newer trucks.

8. **Resale Value** Full-size trucks, especially older models, depreciate quickly. If you plan to sell later, you may not recover much of your investment.

9. **Comfort and Ride Quality** The Avalanche is a heavy-duty truck, meaning it can be **noisy, rough, and uncomfortable** on highways compared to modern trucks with better sound insulation and suspension tuning.

10. **Emissions and Modern Compliance** Some older trucks may not meet current emissions standards if modified, which could complicate registration or insurance in certain states.

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### **Key Considerations Before Purchase**

1. **Transmission History** Ask for service records, especially transmission fluid changes. A transmission flush every 30,000 50,000 miles is crucial. If the fluid has never been changed, the transmission may be on its last legs.

2. **Engine Condition** Listen for unusual noises (ticking, knocking, or rattling) during a test drive. Check for oil leaks, coolant leaks, or excessive smoke from the exhaust.

3. **Frame and Body Rust** Inspect the frame rails, wheel wells, and undercarriage for rust. Rust can weaken structural integrity and lead to costly repairs.

4. **Suspension and Steering** Check for worn shocks, bushings, or ball joints. A rough ride or wandering steering can indicate suspension issues.

5. **Electrical System** Test all lights, gauges, and electronics. A multimeter can help diagnose minor electrical issues.

6. **Test Drive** Drive the truck on different surfaces (highway, rough roads) to check for transmission shifts, engine performance, and handling issues.

7. **Pre-Purchase Inspection (PPI)** **Highly recommended.** A mechanic familiar with GM trucks should inspect the transmission, engine, drivetrain, and body for hidden problems.

---

### **Conclusion and Recommendation**

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

- **Buyers who need a heavy-duty, towing-capable truck on a budget** and are willing to invest in maintenance.

- **Those who plan to modify or upgrade the engine/transmission** (e.g., swapping in an LS engine or rebuilding the transmission).

- **Owners who prioritize raw power and utility over modern comfort or fuel efficiency.**

- **People who can afford potential repairs** and are mechanically inclined or have access to a good mechanic.

#### **Who Should Avoid This Truck?**

- **Buyers looking for a low-maintenance, daily driver** with modern safety and comfort features.

- **Those who cannot afford transmission or engine repairs** (expect to spend **$2,000 $5,000 ** on a transmission rebuild or engine overhaul if issues arise).

- **People who want good fuel economy** (the 6.0L V8 will drain gas quickly).

- **Buyers who dislike older GM trucks reliability quirks** (electrical issues, rust, and outdated tech).

#### **Final Recommendation**

If you find a **well-maintained 2007 GMC Avalanche 1500 with a 6.0L V8 and 400-00297 transmission** (4L60E/4L80E) that has:

- **Documented transmission fluid changes** (every 30,000 50,000 miles).

- **No major engine noises or leaks** (oil, coolant, transmission fluid).

- **Minimal rust in critical areas** (frame, wheel wells).

- **A clean title and no accident history.**

...then it can be a **great value** for someone needing a heavy-duty truck. However, **budget for potential repairs**, especially the transmission and engine, and **get a pre-purchase inspection**.

If the truck has **high mileage without maintenance records**, **transmission issues**, or **severe rust**, it is **not a wise purchase** unless you are prepared for significant expenses.

For most buyers today, a **newer used truck (2010 ) with a modern transmission (6L80E, 10-speed) and better fuel economy** would be a safer and more cost-effective choice. However, if you re set on this specific truck and find a well-cared-for example, it can still be a solid workhorse with the right investment.

Details:

YUKON XL 1500 07 AT; 6.0L, 4x2. AVALANCHE 1500 07 AT; 6.0L, 4x2. SUBURBAN 1500 07 AT; 6.0L, 4x2.

part #: avalnch15 prices

  • $260.00-$360.10

specifications autotransmissionsgo:

  • for models: 1500, 2wd, Avalanche
  • for years: 2007
  • brand: Factory Oem
  • mpn: Avalnch15
  • part type: Transmission
  • conditions options: A4sp Rwd
  • genuine oem: Yes
  • ipn: 400-00297
  • make: Chevrolet
  • manufacturer warranty: 6 Month
  • partout id: A-124736000

general autotransmissionsgo:

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

offer autotransmissionsgo:

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

payments autotransmissionsgo:

  • other
  • wallet: Apple-pay
  • credit card: Mastercard

returns autotransmissionsgo:

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

shipping autotransmissionsgo:

  • service: Flat Rate Freight
  • cost: $300.00
  • type: Fixed
  • class: Freight

seller autotransmissionsgo:

  • rating: 99.1%
  • city: Savannah, Tennessee
  • # reviews: 4945
for models: 1500, 2wd, avalanche, for years: 2007, part type: transmission, conditions options: a4sp rwd, genuine oem: yes, manufacturer warranty: 6 month, partout id: a-124736000,
manufacturer: chevrolet, category: auto parts > car truck parts accessories > transmission drivetrain > automatic transmission, sku: 23604957789192782,
Factory Oem AVALNCH15 Is Similar To:
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2 offers $260.00–$360.10 USD
  • Used. Offer #1 priced at $260.00 + $300.00 shipping estimate = $560.00* total. YUKON XL 1500 07 AT; 6.0L, 4x2 AVALANCHE 1500 07 AT; 6.0L, 4x2.+$300.00 shipping
  • Used. Offer #2 priced at $360.10 + $300.00 shipping estimate = $660.10* total. carry a 6 month warranty.+$300.00 shipping

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