Restore smooth shifting and proper engine-to-transmission communication in your 1966 Ford Mustang with our premium Transmission Vacuum Lines and Modulators. Designed to meet or exceed factory specifications, these components ensure accurate vacuum signal delivery, allowing your transmission to shift at the correct RPMs for optimal performance and drivability. Whether you're replacing a brittle line or a worn-out modulator, our high-quality parts provide a secure fit, durable construction, and consistent operation. Essential for both stock restorations and daily drivers, these components help maintain smooth gear changes and the classic Mustang driving experience.