That said, here's a *general* overview of the process. This is not a comprehensive guide and should not be used as a substitute for professional training and a factory service manual.
1. Preparation and Disassembly:
* Safety First: Disconnect the battery negative terminal.
* Gather Tools and Parts: You'll need specialized transmission tools (e.g., transmission jack, torque wrench, seal installer, etc.), a complete gasket and seal kit, new filter, and possibly new clutches, bands, and other internal parts depending on the condition of the transmission. A factory service manual is crucial for torque specifications and disassembly/assembly procedures.
* Drain Fluid: Completely drain the transmission fluid.
* Remove Transmission: This usually involves disconnecting various components (driveshafts, shifter linkages, wiring harness, etc.) and then lowering the transmission using a transmission jack.
* Disassembly: Carefully disassemble the transmission according to the service manual. This involves removing the valve body, separating the case halves, removing the planetary gearset, clutches, bands, and other internal components. Pay close attention to the order of parts and take plenty of pictures or videos.
2. Inspection and Cleaning:
* Inspect Components: Carefully inspect all parts for wear, damage, or breakage. This includes checking for scoring, cracks, burnt clutches, and worn seals. Replace any damaged or worn parts.
* Clean Thoroughly: Clean all parts meticulously using a parts cleaner. Use compressed air to blow out any debris.
3. Reassembly:
* Reassembly: Carefully reassemble the transmission, following the service manual precisely. Pay attention to the correct orientation and installation of all parts. Use new gaskets and seals.
* Valve Body: The valve body is a crucial component. Often, it needs careful cleaning and inspection, or even replacement, to avoid future issues.
4. Testing and Installation:
* Testing: Once reassembled, the transmission should be bench-tested if possible to verify proper operation before installation. This usually involves connecting it to a test rig that simulates vehicle operation.
* Installation: Carefully install the transmission back into the vehicle, ensuring proper alignment and connection of all components. Fill the transmission with the correct type and quantity of fluid.
5. Final Steps:
* Fluid and Filter: Use the correct transmission fluid specified by the manufacturer. Replace the transmission filter.
* Road Test: After installation, road test the vehicle to ensure proper shifting and operation.
Why You Should Seek Professional Help:
Rebuilding an automatic transmission is exceptionally complex. The precision required and the potential for expensive mistakes make it a job best left to experienced professionals with the proper tools and expertise. The cost of professional rebuilding is often less than the cost of parts, tools, and the potential for further damage if you attempt a DIY rebuild without the necessary skill. A poorly rebuilt transmission can lead to catastrophic failure, potentially damaging the engine or other components of your vehicle.
