I used dyna mat everywhere I could get my hands. used 1/2 inch closed cell foam on top of that. Replacement firewall pad and carpet with jute padding. Big help was when i used 1/2 inch rubber pads on the front cab mounts and new replacement rear cab mounts from LMC. Their mounts have vulcanized rubber press in bushings. My truck is just as quiet inside as my wifes 2004 Subaru.