On the subject of gear shift noise, I quieted down my 7.3L Ford quite a bit with 2 or 3 layers of Reflectix (available at Home Depot/Lowes and others I'm sure) under the boot and the "carpet" -- incredible noise difference! As a matter of fact I noticed on the first drive after replacing the tranny that my hydraulics guy hadn't replaced the stuff... put more down and immediately could hold conversation in the truck again.
It's number 3 on the list of all-time most important items (duct tape and WD-40 being the first 2) for if you're too hot or its too noisy, add Reflectix!
It looks a bit like tinfoil bubblewrap. Used it extensively in the GMC motorhome while mobile and stationary to control heat and noise to very good results, as well.
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