Building a custom automatic transmission for a stock car is a challenging but rewarding endeavor. It requires a deep understanding of transmission mechanics, a meticulous approach, and a passion for racing. This guide will walk you through the process step-by-step, providing insights and tips for success.
Step 1⁚ Choosing the Right Transmission
The first step is to select the appropriate transmission for your car. Consider the engine’s power output, the intended racing class, and the available space in the car. Popular choices include the TH400, the 700R4, and the Powerglide. Research each option thoroughly to determine the best fit.
Step 2⁚ Disassembly and Inspection
Once you have the transmission, it’s time to disassemble it for a thorough inspection. This will reveal any worn or damaged parts that need replacement. Note the condition of clutches, seals, bearings, and other components. Clean and inspect each part before proceeding.
Step 3⁚ Selecting the Right Components
Based on the inspection, choose the appropriate replacement parts. This includes clutches, steels, seals, bearings, and any other components that need upgrading. Consider performance upgrades like high-capacity clutches, hardened steels, and billet components.
Step 4⁚ Assembly and Calibration
With the new components, carefully assemble the transmission. Follow the manufacturer’s instructions and torque specifications precisely. Once assembled, calibrate the transmission to ensure optimal performance. This may involve adjusting shift points, line pressure, and other parameters.
Step 5⁚ Testing and Fine-tuning
After assembly, test the transmission on a dyno or on the track. Observe shift quality, performance, and overall function. Make any necessary adjustments to the calibration to optimize performance and reliability. This may involve fine-tuning shift points, line pressure, and other settings.
Step 6⁚ Maintenance and Care
Regular maintenance is crucial for ensuring the longevity of your custom transmission. This includes frequent fluid changes, inspections for wear and tear, and addressing any issues promptly. Proper care will extend the life of your transmission and ensure consistent performance.
Tips for Success
- Invest in high-quality parts and tools.
- Consult experienced transmission builders for guidance.
- Take your time and work meticulously.
- Test and fine-tune the transmission thoroughly.
- Maintain a clean and organized workspace.
Building a custom automatic transmission for a stock car is a rewarding experience that can significantly enhance performance and longevity. By following these steps and paying attention to detail, you can create a transmission that stands up to the rigors of racing.