Order Mercury Cougar Transmissions & Mercury Cougar Automatic Transmission Parts Catalog. Explore Mercury Cougar Transmissions In Canada. Maintaining the transmission in your Mercury Cougar is crucial for a smooth driving experience. Regular fluid checks and timely filter replacements can extend the life of your vehicle's transmission. Be alert to warning signs like slipping gears or delayed engagement, which could signal the need for a replacement. When selecting a new transmission, consider options like the 4-speed automatic or the 5-speed manual, each offering distinct driving dynamics. High-quality materials and proper installation are paramount to ensure longevity and peak performance. For the ideal upgrade or replacement, our online inventory offers durable and efficient transmissions tailored to fit your Cougar, backed by expert support for a seamless installation process.