DIY Mudflaps

Written by dan seitz
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DIY Mudflaps
Don't let this get all over everyone! Make your own mud flaps. (mud image by Gouma from

Mud flaps are used to keep debris and liquid on the road from spraying onto other vehicles and pedestrians. In some areas, mud flaps are legally required. However, mud flaps aren't standard equipment on most vehicles and they are an expensive aftermarket extra. Fortunately, designing and installing your own mud flaps is a fairly simple process. With a little patience and a hour or so of time, you can have custom mudflaps of your very own.

Skill level:

Things you need

  • Industrial black rubber
  • Cutting tool
  • Bolts
  • Ratchet
  • screw thread sealer
  • Cold-weld bonding agent
  • Drill
  • 1-inch steel brackets
  • Steel bar
  • Alloy strip

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  1. 1

    Inspect each bumper of your car to see if there are mounts to secure mudflaps. If not, measure the distance between your left and right rear fenders. Also measure the width of each bumper. Examine the undercarriage of your car and look for a place to bolt a steel bar to the frame. Check both sides to ensure bolting a bar to the undercarriage will not interfere with any of the car's normal functions. Measure how close the rear of the bumper is to the ground.

  2. 2

    Secure the alloy strip to the steel bar in an "L" shape with a cold-weld bonding agent such as JB Weld, being careful to wipe away any excess quickly. Drill a hole in either end of the bar and bolt the brackets to it, threading the bolts with a screw-thread-locker such as Lock-Tite to secure them. Cut the rubber to slightly wider than the size of the tire and long enough to hang 2 inches from the ground. Bolt the rubber flaps to either side of the steel bar, putting bolts through the alloy strip.

  3. 3

    Drill two holes into the undercarriage of your car. Use the shortest bit possible to avoid damaging any vital auto components behind the holes you make. Bolt the completed mud flap assembly to the undercarriage, threading the bolts with a thread locker. Check your flaps to ensure that no vital functions, such as the exhaust pipe, have been blocked. If necessary, use the cutting tool to trim away excess rubber. Drive your car around the block a few times to ensure the assembly is secure.

Tips and warnings

  • Paint designs on your mudflaps before you install the assembly, if you desire.
  • Be very careful when drilling into your car's undercarriage.

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