Elevate your classic Chevrolet Truck, Pick-Up, Suburban, or Blazer's performance with the Lectric Limited Classic Update Series Torque Converter Lock-Up Switch Update Kit. This innovative solution allows for automatic operation of your torque converter lock-up (overdrive) without the need for complex computer installations. Designed exclusively for use with GM 700R4 or 2004R automatic transmissions (excluding 4L60E or 4L80E), this kit enhances your vehicle's efficiency and driving dynamics, making it a must-have upgrade for any serious automotive enthusiast.