1. Automatic Transmissions Products
  2. sku: 23793184689782813
  3. ATK ENGINES 1252A-HP

ATK ENGINES 1252A-HP Gm Automatic Transmission 653517528613

fits model: 4l60e, Rwd.

1252a-hp Atk Engines Remanufactured Gm 4l60e Rwd Automatic Transmission

( Brand: Atk Engines ), ( Manufacturer Part Number: 1252A-HP ), ( Part Type: Transmission ), ( Country Of Origin: Usa ), ( UPC: 653517528613 )

Review ATK ENGINES Remanufactured Gm Automatic Transmission fits 4L60E RWD

The **ATK Engines 1252A-HP GM 4L60E Rear-Wheel Drive (RWD) Automatic Transmission** is a meticulously crafted, high-performance replacement transmission designed to deliver unmatched reliability, durability, and performance for classic and modern vehicles equipped with the legendary GM 4L60E automatic transmission. Engineered with precision and built to exacting standards, this transmission is an ideal solution for enthusiasts seeking to restore or upgrade their vehicles with a unit that combines the robustness of a professional-grade rebuild with the power and efficiency of a factory-spec component. The 4L60E, originally developed for General Motors full-size trucks and muscle cars, is renowned for its robust torque capacity, smooth shifting, and adaptability to high-performance applications, making it a favorite among tuners and restorers alike. ATK Engines version of this transmission is not merely a rebuild it is a meticulously assembled, performance-tuned unit that incorporates high-quality internal components, including a reinforced torque converter, upgraded clutch packs, and precision-machined planetary gears, all designed to withstand the demands of aggressive driving, towing, and high horsepower applications. Whether installed in a classic Chevrolet Impala, a restored GMC Sierra, or a heavily modified muscle car, this transmission ensures seamless operation, reduced wear, and extended longevity, even under the most demanding conditions. Built with a focus on both performance and longevity, the ATK Engines 4L60E RWD transmission features a robust housing with reinforced welds and a sealed, leak-proof design to prevent fluid contamination and ensure consistent operation. The transmission s internal components, including the valve body, solenoids, and shift solenoids, are either upgraded or replaced with high-performance alternatives to enhance shifting precision, reduce lag, and improve overall responsiveness. Additionally, the transmission is paired with a heavy-duty torque converter that is optimized for better stall speed and improved torque multiplication, making it an excellent choice for vehicles with forced induction or high horsepower setups. ATK Engines commitment to quality extends beyond the transmission itself, as they provide comprehensive documentation, including wiring diagrams, installation guides, and torque specifications, to ensure a smooth and successful installation process. Whether you are restoring a vintage vehicle, upgrading a daily driver, or preparing a high-performance street or strip machine, the ATK Engines 1252A-HP GM 4L60E RWD Automatic Transmission delivers the reliability, performance, and peace of mind that comes with a professionally built, high-quality component. With its blend of factory heritage and modern engineering, this transmission stands as a testament to ATK Engines dedication to excellence in the aftermarket automotive industry.

### **Pros and Cons of Buying an ATK Engines 1252A-HP GM 4L60E RWD Automatic Transmission**

#### **Pros:**

1. **High Performance and Reliability** The **1252A-HP** is a high-performance version of the **GM 4L60E**, meaning it has been tuned for better torque handling, smoother shifts, and improved durability compared to stock units. This makes it ideal for high-torque applications, including muscle cars, trucks, and performance builds.

2. **RWD (Rear-Wheel Drive) Compatibility** Since this is a **RWD-specific** transmission, it is designed to work seamlessly with rear-wheel-drive vehicles, reducing potential drivetrain conflicts that can occur with FWD or AWD units.

3. **Better Shift Quality** The **4L60E** is known for its strong, durable construction, and the **1252A-HP** version further enhances shift smoothness and precision, reducing jerkiness in gear changes.

4. **Compatibility with High-Torque Engines** The **4L60E** is a robust automatic transmission that can handle significant power outputs, making it suitable for engines producing **400 horsepower** when properly supported.

5. **Aftermarket Support** The **4L60E** is one of the most popular transmissions in the aftermarket, meaning you ll find a wide range of **gaskets, bands, solenoids, and rebuild kits** available for maintenance and upgrades.

6. **Proven Durability** The **4L60E** has a long history of reliability in GM vehicles, and the **1252A-HP** version maintains this reputation while offering slight improvements in performance.

7. **Easier to Modify** Unlike some modern transmissions, the **4L60E** is relatively simple to modify, allowing for **custom shift programming, torque converter upgrades, and internal reinforcement** for extreme power.

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#### **Cons:**

1. **Cost** A **1252A-HP GM 4L60E** is more expensive than a stock unit, especially if purchased from a reputable tuner or builder. Prices can range from **$1,500 to $3,000 **, depending on condition and modifications.

2. **Requires Proper Installation & Tuning** While the **4L60E** is durable, improper installation (such as incorrect fluid selection, lack of support, or wrong torque settings) can lead to premature failure. A **properly tuned ECU and drivetrain setup** are essential.

3. **Limited Modern Compatibility** Some newer vehicles may have **electronic drivetrain control modules (DTCMs)** that require reprogramming or bypassing to work correctly with a modified transmission.

4. **Maintenance Requirements** Like any high-performance transmission, the **4L60E** demands **regular fluid changes, band adjustments, and potential internal upgrades** (such as reinforced input/output shafts) to handle sustained high power.

5. **Weight and Size** The **4L60E** is a **heavier and bulkier** transmission compared to some modern alternatives, which may require **reinforced mounts and drivetrain components** in high-performance applications.

6. **Potential for Overheating** If not properly cooled (via an **aftermarket cooler or upgraded oil pump**), the transmission can overheat under extreme loads, leading to **slipping or failure**.

7. **Limited Availability of New Units** Since the **4L60E** is no longer produced by GM, finding a **brand-new, unmodified unit** can be difficult. Most buyers must rely on **rebuilt or remanufactured units**, which may have varying quality levels.

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### **Conclusion:**

The **ATK Engines 1252A-HP GM 4L60E RWD automatic transmission** is an excellent choice for **high-performance RWD applications** where reliability, smooth shifting, and torque handling are critical. It offers **superior performance over stock units** and remains a **durable, well-supported transmission** in the aftermarket.

However, it is **not a plug-and-play solution** it requires **proper installation, tuning, and maintenance** to prevent issues. The **cost and complexity** of ownership mean it is best suited for **serious builders, restomods, or high-performance enthusiasts** rather than casual drivers.

If your goal is **maximum reliability with minimal hassle**, a **remanufactured stock 4L60E** or a **modern alternative (like a Tremec TR6060 or Aisin WAR1)** might be more practical. But if you re **building a high-torque RWD project** and willing to invest in proper support, the **1252A-HP is a strong, proven choice**.

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### **Recommendation:** - **Buy it if:**

- You are building a **high-torque RWD vehicle** (e.g., muscle car, truck, or performance build).

- You have **experience with transmissions** or are working with a **trusted mechanic**.

- You plan to **properly support the transmission** with **cooling, fluid, and potential internal upgrades**.

- You want a **tuned, high-performance version** of the **4L60E** rather than a stock unit.

- **Avoid it if:**

- You are on a **tight budget** and cannot afford proper installation or maintenance.

- Your project is **not RWD** (FWD or AWD applications may require modifications).

- You prefer a **simpler, more modern transmission** with less tuning complexity.

- You lack **mechanical experience** and cannot ensure correct setup.

**Final Verdict:** For the right builder, the **1252A-HP GM 4L60E** is a **highly capable, performance-focused transmission** that delivers where stock units fall short. Just ensure you **meet its demands** with proper support and tuning.

Details:

American Express.

specifications autotransmissionsgo:

  • for models: 4l60e, Rwd
  • brand: Atk Engines
  • mpn: 1252a-hp
  • part type: Transmission
  • country of origin: Usa
  • upc: 653517528613

payments autotransmissionsgo:

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

seller autotransmissionsgo:

  • rating: 99.4%
  • # reviews: 629380
  • city: , Ohio

offer autotransmissionsgo:

  • options: Ship-to-home
  • started: May 11, 2026
  • availability: In Stock
  • sold: 0
  • quantity: 1

shipping autotransmissionsgo:

  • class: Standard
  • cost: $0.00
  • transit: 3-9 Days
  • service: Standard
  • type: Fixed

returns autotransmissionsgo:

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

general autotransmissionsgo:

  • condition: Remanufactured
  • Car Truck Parts Accessories > Transmission Drivetrain > Automatic Transmission
for models: 4l60e, rwd, part type: transmission, country of origin: usa,
category: auto parts > car truck parts accessories > transmission drivetrain > automatic transmission, sku: 23793184689782813,
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