Troubleshooting the Dodge W150 Transmission Mount
The purpose of the Dodge W150 transmission mount is to secure the main engine driveshaft to the frame of the vehicle. The rubber bricks inside the mount help stabilize the transmission and prevent the vehicle from shaking and rattling. If the transmission mount is damaged, got loose, worn out, or missing, you will experience unstable ride, feel vibration inside the cabin, and hear clunking or knocking sound underneath the vehicle. It is important, therefore, that you know how to respond properly should your transmission mount begins to show signs of failure.
Increased engine driveshaft vibration as the vehicle accelerates
This is one of the most obvious signs of a broken transmission mount. Since a broken transmission mount no longer support and stabilize the vehicle properly, vibration and shaking in the engine driveshaft can be felt in the cabin, especially at higher speed. Stop using the vehicle once you feel this unusual vibration. Check the transmission mount for damage. If it is broken, replace it right away. Not doing so will cause more transmission problems and expensive repairs.
Noise underneath the vehicle
While the noise from the underside of the vehicle can come from anything, one probable reason is a broken or damaged transmission mount. The vehicle's transmission mount keeps the transmission aligned to the engine driveshaft. If the transmission mount is broken or damaged, there's nothing that will the two in place, causing misalignment and producing clunking noise. If the vehicle is driven in this condition, it can result to severe damage in the driveshaft, driveshaft coupling, and transmission-and a huge repair bill. Any metal-to-metal noise must be inspected and must be addressed right away. A broken transmission mount must be replaced or repaired (if possible) and any collateral damaged (transmission and driveshaft) must be assessed. Take note that when you work underneath your vehicle, dirt, oil, metal, and other fluids may fall from the vehicle you're working on. Use protective glasses to prevent eye injury. Use gloves to protect your hands as well.
Transmission mount is missing
In rare cases, the transmission mount may fall off the vehicle. There's no other way to fix this than by replacing the transmission mount. And since the transmission and the driveshaft can be damaged as well, inspect for metal wear on areas that link the two.