Mount Transmission, 1997-2006 TJ By Rugged Ridge. Your transmission mount secures the engine and transmission to your Jeep and absorbs the road-shocks and engine vibrations so that the driver does not feel any engine movement. Signs that it might be time to replace it include engine or transmission movement, bumping or clunking noises or a loud noise when you put the car in gear. This red transmission mount is made of polyurethane which is a stronger replacement than rubber and lasts for as long as you need it! Bolt-on application for a direct fit and easy installation.