see my recent article
http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=20;t=000316;p=1#000000
My suggestion to quite the cab:
. Buy a roll (cause it's cheaper, about $50.) of Dynamat. This stuff ain't cheap to begin with, but it works wonders!! You can cut w/ sissors, peel off the backing and stick it to the cleaned metal roof, door, or back panel of your truck. This product helps deaden the ''rattle can'' and road noises, allowing you to better hear yourselves, prevents hearing problems and makes listening to (if you have) music, a treat. You don't need to cover the entire metal panel, just the centre section. I put it on all of the cab's back panels, roof, and have plenty left to do the doors, a thin strip under the dash and centre floor panel to cut the rattling down when the radio's speakers are on. You could also cover with a jute material, which is Flimsy @ best and NOT very dense, or the better two 'foil' sided heavy duty jute to help deaden the sound. This stuff can also be cut with sissors and get placed on the floor to deaden the road noise. Many truck suppliers carry it as well as good auto stores & hotrod type shops. It also helps cut the sun's heating the cab in summer and holds your heaters heat in winter. I would suggest that after you cut this two sided foil jute material that you ''bind'' the edges w/ furnace tape, a sticky backed silver tape available at home depot type hardware stores. All the above can also be glued into place, after dry-fitting using a good grade of 3M spray glue. Then a carpet kit (I bought short napped carpet ~ don't glue down) which I hand cut to fit the floor. I used the old rubber floor covering as a templete to cut the carpet.
I hope this helps quite your ride.