How to Disassemble an Automatic Transmission Step by Step

Disassembling an automatic transmission is a complex task that requires precision and patience. Below, we will guide you step by step to perform the job safely and efficiently.

📝 Preparation

Transmission Fluid Handling Precautions

Transmission fluid is corrosive and can damage your skin and eyes. Use an appropriate container to drain the fluid and keep absorbent materials handy in case of spills.

🧾 Steps to Disassemble an Automatic Transmission

🔋 Disconnect the Battery and Electrical Components: Before working with any electrical components, disconnect the battery to avoid accidents.

💧 Drain the Transmission Fluid Safely: Locate the transmission drain plug and empty the fluid into a suitable container. Be sure to dispose of it responsibly.

🔧 Remove the Drive Shaft: Use the appropriate wrench to remove the drive shaft. This will disconnect the transmission from the vehicle's propulsion system.

🪛 Unbolt the Transmission Mounts: The mounts hold the transmission in place. Loosen the bolts holding them, but be careful with hard-to-reach bolts.

⚙️ Remove the Gear Linkage: Remove the linkage connecting the transmission to the gear lever. This step usually requires a small screwdriver to loosen the pins.

🔗 Disconnect the Transmission Cooler Lines: Disconnect the lines that carry fluid to the transmission cooler. Make sure to have a towel or rag ready to clean up any fluid spills.

⬇️ How to Lower the Transmission Safely: Once all components are disconnected, use a hydraulic jack to lower the transmission in a controlled manner. If you need help, make sure to have someone nearby to assist with lifting the load.

🚚 Transporting and Storing the Transmission: After removing the transmission, place it on a safe surface. If you plan to transport it, make sure to secure it to avoid damage.

🔧 How to Deal with Rusted or Seized Bolts

If you encounter rusted or seized bolts, use penetrating lubricant and let it sit for a few minutes. If it still doesn’t loosen, use a bolt extractor.

📏 Managing Space Limitations Under the Vehicle

In some vehicles, space under the chassis may be limited. Use compact tools and adjust the height of the hydraulic jack to create more room.

✅ Best Practices Post-Extraction

Once the transmission is out, it's important to inspect it carefully to determine if it needs repair or replacement. Additionally, check the adjacent parts and the general condition of the gearbox before reassembling the vehicle.

At Sun Transmission, you’ll find the parts you need to keep your vehicle’s transmission in top condition. Browse our online store to discover all the transmission parts we have available for you, including solenoids, seals, filters, and more. Shop now and ensure your transmission runs smoothly for miles to come!