The Stovebolt Site Forums The Shop Area Interiors Sound deadening

I've learned the front cab mount pads in the 3100 will naturally over time settle. The rear ones not so much. I've also learned the replacement pads (which seem to be all made by the same outfit) will settle very quickly...maybe within a few months. If this happens, the front part of the cab will rest right on the mounting spot and that will telegraph lots of noise into the cab. You might think the cab would also be loose as a result, but I haven't found this to be as much of a problem as the noise. You will notice your brake pedal rod may hang in its opening, however. Doesn't take much cab-settling to make this happen. In my experience you need at least 3mm or so of space between the two. Not easy to get an image, but I tried so please look below. How to fix? Go to any hardware store or plumbing supply store and buy some of the material used for shower pan liner. It is a hard but insulating PVC sheet. Then cut rectangles about 2" x 3" and punch or cut with a box cutter a hole for your mounting bolt. Laminate these until you get a height that works for you. Do it for both sides. That stuff won't settle but it will do a good job of insulating against metal to metal transmission of noise (which can be surprisingly loud). If this is a problem for you, solving it should help.