The 10 Best Transmission Additives
We spent 28 hours on research, videography, and editing, to review the top options for this wiki. Transmission health is crucial to a working vehicle, but sometimes a complete flush can stir up small particles and endanger the finely-machined components. If your gearbox starts to whine, hesitate, or make clunking noises, or if you often tow heavy loads using a high-mileage drivetrain, one of these additives can protect and renew your machine for the long haul. When users buy our independently chosen editorial picks, we may earn commissions to support our work. Skip to the best transmission additive on Amazon.