I have a 2000 Explorer XLT with 57,000 miles. There is a strong vibration that increases and decreases with speed and resembles a thumping sound under the floorboard.
Tires and brakes are okay.
Any suggestions appreciated.
JW
I'm no expert, but I'd see if your U joints need replacement. You can do this by twisting your driveshaft and see if there is any play in it.
Paul
Check your universal joint. I just replaced mine last night for a similar, but very slight, vibration.
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