Truck makes a flapping noise when driving down the road sounds like it is coming from (l) rear
Dec 6, 2011 at 6:16 PM
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DRCRANKNWRENCH
✓Experienced Mechanic
3,380 POSTS
Most likely the inner fender well has come loose. This is common especially if you have oversized tires. But over time the clips and screws that hold it in place loosen or fall out and the inner fender rubs the tuire and then starts flapping around.