noise on any Jeep (or any car, for that matter) can be a nuisance at highway
speeds. What I am going to show you in the following photos won't turn your Jeep
into a Lexus sedan (why would you want one?), but it will noticeably reduce road
noise emanating from the steel floorboard. Done properly, it will also keep your
floorboard from rusting from beneath, by filling the void between the floorboard
and the lower tub. Another page on this Web site shows you how to build a
Turn Signal Beeper so that you can hear if
you left your turn signals on in noisy traffic.
Rhino Lining and then
Replacing the factory carpet with a thick, rubber-backed carpet after
is a good way to reduce road noise and prevent floorboards from rusting, but
BEFORE you install the carpeting, there is one more very inexpensive thing you
can do to reduce rusting and deadening road noise.
Wranglers have a unique floorboard design; if you remove the drain plugs under
the carpet, you will see that there is a lower floorboard, about 1 inch below
the one in the passenger compartment. The problem with this design is that road
salts and moisture can enter between the floorboards and corrode both the
top and bottom of the "tub".
prevent rust in this area, simply remove the lower drain plug on each side (if there is one) and flush between
the floorboards (from the bottom of the Jeep) with a garden hose. Allow the
space to dry by driving around a few days, and parking the Jeep on a hill facing
down one day, and facing up the next day. Then use a nozzle extension to spray
Rust-Oleum Rust Inhibitor
into the space as far as you can reach inside,
and allow the paint to dry for 48 hours.
- Gap Filler Foam" to completely fill the space between the floorboards, and tape the drain
holes shut with Gorilla Tape
until the foam expands and cures.
There is also a hollow space on the floorboard where the front seats bolt down.
Lift the carpet and use a flashlight to find them. Use a nozzle extension (or
make one from a long plastic straw), and spray the foam as deep into these
spaces as possible. After you inject the foam, immediately cover the hole with Gorilla Tape
to keep the foam from oozing out. Inject foam into every hole you can find that
goes into the "between spaces" on the floorboard, and tape the holes shut.
cans is more than enough to do the job. Allow the stuff to expand for 24 hours
(it will ooze out in some places;
attempt to wipe it up as it oozes out; it is
WICKED STICKY, like
the cocooning goo the monsters used in the movie "Aliens"
– but it is easy to remove
once it is cured).
the stuff has cured, pull off (or cut, scrape off) all the foam that has oozed
out of the weld gaps and other places. Use a
sharp, narrow razor to cut the drain holes open again, and replace the plugs.
The road noise (floorboard vibrations) will be drastically
reduced, and a water path into the Jeep will be blocked (in case you are
crossing deep puddles). The treatment can also be applied to all the other
hollow spaces such as the frame members, mainly for rust abatement, but if every
hollow space on the underside of the vehicle is plugged, you could add a
Snorkel Kit to convert your Jeep
to an amphibious vehicle ☺ (only kidding!).