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The route you chose is dependent on the end goal you seek. A good vibration dampener will stop body panels from vibrating...this helps but will not stop sound from passing through a panel. Since you state that you are looking to dampen the sound inside the cab you will need some amount of vibration dampener and some sound absorption material inside the cab. Gaining a good understanding of the physics of sound energy will enable you to make the best choice for products to use in your truck. Many people equate "low price" with "high performance"...while price may or may not be a consideration for you, make sure that you consider this aspect when reading about others experiences with various products.
The route you chose is dependent on the end goal you seek. A good vibration dampener will stop body panels from vibrating...this helps but will not stop sound from passing through a panel. Since you state that you are looking to dampen the sound inside the cab you will need some amount of vibration dampener and some sound absorption material inside the cab. Gaining a good understanding of the physics of sound energy will enable you to make the best choice for products to use in your truck. Many people equate "low price" with "high performance"...while price may or may not be a consideration for you, make sure that you consider this aspect when reading about others experiences with various products.