I used dynamatt forget which version, the gooy one side alumin foil the other. Thats all they really had 15 years ago. Also dynamatt/pad or some soft foam like stuff, no adhesive on it so thats under floor. behind firewall to seast.. And Bed liner really does help sound and heat.
I did not do doors, they still need tweaking. nothing on quarters other than bedliner and accmatt carpet. Tailgate I sound proofed it by using hosing around anything that moved, then a few sheets of dyna. Hardtop is all dynamatt and that crappy cardboard liner.
I also used dynamatt off firewall, along with hi temp reflective aluminum, then finished with Wild Horse firewall insulation kit. No heat felt on that anywhere.
I wrapped exhaust pipe, not headers, from behind header to muffler. You can almost touch the wrap with engine on, almost.
You cannot feel heat up from floor at transmission.