Converting a 4L60E transmission to a non-electronic (mechanical) configuration is a complex and custom modification that involves replacing many of the electronic components with mechanical ones. This conversion is typically done in specialized applications where electronic controls are not desired. Here’s a general overview of the steps involved:
Important Note: Converting a 4L60E to non-electronic operation is a significant undertaking and should only be done by experienced individuals or professionals with a strong understanding of automotive transmissions. It may also have legal and emissions implications depending on your location.
Materials Needed:
- Mechanical linkage kit (throttle valve cable or TV cable)
- Manual valve body or shift kit (to control gear shifts manually)
- Mechanical speedometer drive (if required)
- Torque converter (compatible with non-electronic setup)
- Transmission fluid and gasket
- Tools (wrenches, sockets, jack, jack stands)
Steps:
- Safety First: Ensure that your vehicle is parked on a level surface, and you have proper safety equipment, including jack stands and personal protective gear.
- Drain Fluid: Locate the transmission pan and drain the transmission fluid. You may need to remove the pan to access the fluid completely. Be sure to properly dispose of the old fluid according to local regulations.
- Disconnect Transmission: Unbolt the transmission from the engine block and slide it slightly rearward, supporting it with a transmission jack if available.
- Remove Electronic Components:
- Remove the transmission’s electronic components, including the transmission control module (TCM), wiring harnesses, and sensors.
- Disconnect and remove any electronic shift solenoids and related wiring.
- Install Mechanical Linkage: Replace the electronic throttle valve cable (TV cable) with a mechanical linkage kit. The TV cable is crucial for controlling line pressure and shift points in non-electronic setups. Follow the kit’s instructions for installation and adjustment.
- Manual Valve Body or Shift Kit: Install a manual valve body or shift kit in the transmission. This will allow you to manually control gear shifts without electronic intervention.
- Speedometer Drive (if needed): If your vehicle relies on the transmission for the speedometer reading, install a mechanical speedometer drive that is compatible with your vehicle’s speedometer cable.
- Replace Torque Converter: Install a torque converter that is compatible with the non-electronic setup. Ensure it is properly seated in the transmission.
- Reconnect Transmission: Carefully slide the modified transmission back into position and bolt it to the engine block. Torque the bolts to the manufacturer’s specifications.
- Fill with Transmission Fluid: Fill the transmission with the appropriate type and amount of transmission fluid as specified in your vehicle’s manual.
- Test Drive: Start the vehicle and take it for a test drive to ensure that the transmission is functioning correctly. Check for any leaks and verify that gear shifts can be controlled manually using the mechanical linkage.
- Check Fluid Level: After the test drive, check the transmission fluid level and top it off as needed.
- Final Adjustments: Make any final adjustments or tightening as necessary, ensuring that all components are secure.
Please note that this conversion involves removing critical electronic control components, which can affect the safety and performance of your vehicle. It should only be done with a clear understanding of the implications and in a safe and legal manner. Additionally, consult your vehicle’s service manual for specific instructions and torque specifications.
