CHEVROLET TRUCK SILV15NEW Automatic Transmission 400-04466 5.3L

( Brand: Chevrolet Truck ), ( Manufacturer Part Number: SILV15NEW ), ( Part Type: Transmission ), ( Conditions Options: 5.3l ), ( Genuine Oem: Yes ), ( Ipn: 400-04466 )

Review CHEVROLET TRUCK Automatic Transmission 5.3l Pickup fits CLASSIC SIERRA 1500 2004–2007

The **Chevrolet 400-04466 Automatic Transmission** is a robust and meticulously engineered component designed exclusively for the **5.3L Vortec V8** found in the **2004-2007 Chevrolet Silverado 1500 and GMC Sierra 1500** full-size pickup trucks. This transmission is a **4-speed automatic overdrive unit**, built to deliver seamless power delivery, exceptional durability, and reliable performance under the most demanding conditions. Crafted with precision, the 400-series transmission features a **heavy-duty torque converter** that efficiently transfers power from the engine to the drivetrain, ensuring smooth acceleration and optimal fuel economy without sacrificing towing or hauling capability. The robust **planetary gearset** and **hydraulic valve body** work in tandem to provide crisp shifting, reducing wear and tear while maintaining the truck s signature towing prowess capable of handling payloads and trailers well beyond the factory specifications. Engineered with **high-quality cast iron housing** and reinforced internal components, this transmission is built to withstand the rigors of heavy-duty work, off-road adventures, or daily commuting with equal ease. Whether you're hauling a heavy load, towing a boat or camper, or simply driving through rough terrain, the **400-04466** ensures consistent performance and longevity. This transmission is a direct replacement for the factory unit, compatible with the **5.3L Vortec V8 s** power output, and is backed by the same engineering standards that made the original a trusted workhorse. For truck owners seeking a reliable upgrade or a high-quality replacement, this transmission offers the perfect blend of performance, durability, and compatibility to keep your Silverado or Sierra running strong for years to come.

### **Pros and Cons of Buying a Chevrolet 400-04466 Automatic Transmission for a 2004-2007 5.3L Sierra 1500**

#### **Pros**

1. **Compatibility and Reliability** The **400-04466** is a well-known, widely used automatic transmission for the **LS1-based 5.3L V8** in the 2004-2007 Chevrolet Sierra 1500. It is a **remanufactured version of the original 4L60-E**, meaning it has been rebuilt to factory specifications, improving reliability compared to a used or salvaged unit.

2. **Better Than Stock Transmission** The stock **4L60-E** in these trucks can be prone to **slippage, rough shifting, and premature failure**, especially if not maintained properly. A **remanufactured 400-04466** is often **more durable** and less likely to develop early issues.

3. **Warranty Coverage** Most reputable transmission remanufacturers (such as **400Transmissions, Summit Racing, or local rebuilders**) offer **1-year warranties**, providing peace of mind against defects.

4. **Improved Performance** Some remanufacturers **upgrade internal components** (such as clutches, bands, and solenoids) to **reduce wear and improve shifting smoothness**, making the truck drive better than stock.

5. **Cost-Effective Upgrade** Replacing a failing stock transmission can be **expensive** (often $2,000 $4,000 for labor and parts). A **remanufactured 400-04466** is typically **cheaper** ($1,200 $2,000 installed) and a **safer long-term solution** than a used transmission.

6. **Better for Towing & Hauling** If you plan to **tow or haul heavy loads**, a **properly rebuilt transmission** will handle the stress better than a worn-out stock unit.

7. **Easier to Find Parts & Support** Since this is a **common remanufactured unit**, finding **replacement parts, fluids, and service support** is easier than with rare or custom transmissions.

---

#### **Cons**

1. **Not a Full "High-Performance" Transmission** While the **400-04466 is an improvement over stock**, it is **not a race-ready or high-performance transmission**. If you plan to **modify the engine significantly (turbo, supercharger, or extreme power gains)**, you may need a **custom transmission or a stronger unit** (such as a **4L85E or a built 4L60-E**).

2. **Potential for Early Failure if Not Installed Properly** If the **installation is rushed, fluids are not changed properly, or supporting components (like the torque converter or flywheel) are worn**, the transmission may still fail prematurely.

3. **Cost of Installation** While the transmission itself is affordable, **labor costs** (especially if you need a **transmission specialist**) can add up. Some shops charge **$800 $1,500 just for installation**.

4. **Still Requires Proper Maintenance** A remanufactured transmission **will not last forever** if fluids are **never changed** or if the truck is **abused (towing without a proper transmission cooler, etc.)**. You must **follow maintenance schedules** (fluid changes every **30K 50K miles**).

5. **Possible Compatibility Issues with Mods** If you have **aftermarket modifications** (such as a **performance exhaust, ECU tune, or drivetrain upgrades**), the transmission may **shift differently** than expected. Some owners report **harsh shifts or hesitation** until the system adjusts.

6. **Not as Durable as a Built Transmission** While a **remanufactured unit is better than stock**, it is **not as robust as a fully rebuilt (built) transmission** where every component is **new or heavily refurbished**. A **built 4L60-E** would be more durable but also more expensive.

---

### **Ending Conclusion & Recommendation**

The **Chevrolet 400-04466 automatic transmission** is a **solid choice** for a **2004-2007 5.3L Sierra 1500** if you are looking to **replace a failing stock transmission** or **improve reliability** without breaking the bank. It offers **better shifting, durability, and warranty coverage** compared to a used or salvaged unit.

**However**, it is **not a perfect solution** it is **not a high-performance transmission**, and it **still requires proper maintenance** to last. If you **plan to heavily modify the engine** or **tow extreme loads**, you may need to consider a **custom transmission or a more robust unit** (such as a **4L85E or a built 4L60-E**).

- Your **stock transmission is failing** (slipping, rough shifting, leaks).

- You want a **reliable, warranty-covered upgrade** without spending thousands.

- You **don t plan major engine modifications** (turbo/supercharger, extreme power).

- You **follow maintenance** (fluid changes, proper cooling if towing).

- You **plan to build significant horsepower** (may need a **custom transmission**).

- You want **maximum durability** (a **built 4L60-E or 4L85E** may be worth the extra cost).

- You **don t want to deal with potential shifting issues** (a **stock transmission swap with a rebuild** might be better if you re on a tight budget).

- **Get it installed by a reputable shop** (preferably one with **LS1/Sierra experience**).

- **Use a high-quality transmission fluid** (such as **Mobil 1 ATF or Valvoline MaxLife**).

- **Consider adding a transmission cooler** if you **tow or haul frequently**.

- **Monitor for early signs of wear** (unusual noises, delayed shifts) and **address them quickly**.

**Overall, the 400-04466 is a smart upgrade for most owners of these trucks**, but it s not a "set-and-forget" solution **proper care is essential** for long-term reliability.

Details:

SILVERADO 1500 PICKUP 07 AT; Classic creased door skin, 5.3L, 4x4, w/hybrid option opt HP2. SIERRA 1500 PICKUP 07 AT; Classic creased door skin, 5.3L, 4x4, w/hybrid option opt HP2. SIERRA 1500 PICKUP 04-06 AT, 5.3L, 4x4, w/hybrid option opt HP2.

part #: silv15new prices

• $101.39-$200.00

specifications autotransmissionsgo:

• for models: 1500, Classic, Sierra
• for makes: Chevrolet
• for years: 2004-2007
• brand: Chevrolet Truck
• mpn: Silv15new
• part type: Transmission
• conditions options: 5.3l
• genuine oem: Yes
• ipn: 400-04466

shipping autotransmissionsgo:

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

seller autotransmissionsgo:

• # reviews: 132
• city: Fredericksburg, Virginia
• rating: 100.0%

payments autotransmissionsgo:

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

offer autotransmissionsgo:

• availability: In Stock
• options: Ship-to-home
• started: March 18, 2026
• quantity: 1
• sold: 0
• best offers: True

returns autotransmissionsgo:

• paid by: Seller
• policy: Returns Accepted
• time: 60 Days

general autotransmissionsgo:

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

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