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Hey all - I’m at the end of my rope chasing a thumping sound on my 2004 Sequoia. I’ve been to tire shops, mechanics, and still can’t figure out what is going on.

Symptoms: “thump” or “wub” sound from front driver side. It sounds like a flat spot or flat tire almost. I can feel it through the pedal as I drive. It is rotational, and speeds up as I speed up.

What I’ve tried/noticed/been told: First mechanic said the issue was tires so I had them rotated and the sound remained at the front driver side. While at discount tire, they said wheel bearing noise was evident, so I went to a new mechanic who drove and did various diagnostics and said it was not the wheel bearing, but could not figure out what it was.

Other observations: 4WD does not make a difference, neutral does not make a difference, it happens while applying brakes or not applying brakes. When I jack it up and spin the tire I cannot replicate them sound manually.

Somebody please help!! I’m going nuts over here.
 

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Have your replaced the fluid in the transfer case and rear diff ! Just noodling if that could be a cause,,not that I know. The fluids should be replaced every 60k miles. I waited until about 100k miles and replaced trans fluid and all others at the same time and the vehicle drove smooth as silk afterwards , not so much before the change out of the fluids.
 
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