Hello folks, thanks in advance for any advice you might have, here we go:
I get a slow pulsing noise/shudder in my truck, kind of a barely perceptible grinding noise accompanied by an also barely perceptible shudder.

- it's directly proportional to the speed of the vehicle; speeds up and slows down with vehicle speed, doesn't change with shifting.
- the pulses are slower than tire speed, it pulses once for about every 2 or 3 turns of a tire
- I already changed out the parking brakes - they were bad, but it didn't fix the problem. The pulsing is not the right speed for a brake problem anyway.
- It seems to appear only after the truck has been driven a little ways, hard to notice it when everything is cold.
- It seems a little worse around left turns
- going in or out of 4wd has no effect.
- truck is a 2004 XLT, reg cab shortbox 5.4 liter 4wd.
- I have to be on a fairly smooth surface to hear it. So far.

I'm wondering if it's part of the limited slip diff,(assuming it has one) but that wouldn't explain why the noise is there when I'm going in straight line. Transfer case, transmission maybe?

Anyway, thanks again.

 

mabey its just your tires getting old

 

Tires are new, <5000 miles.

 

Left front wheel bearing; just replaced it and all is well.