I hear a thump thump thumb in the front end . on 2003 Ford Explorer Sport Trac

The thump thump thump that seems to be associated with wheel speed---it is worse when driving straight
I replaced the front outer tie rods on both sides but the problem was not corrected. Any ideas?

Asked by for the 2003 Ford Explorer Sport Trac
The thumping you are experiencing could be a few different things. In order of likelihood in my opinion:

1) faulty tire. A tire or tires that have a flat spot or abnormal wear will make many possible noises - thumping is one of them.

2) A wheel bearing. A faulty wheel bearing may grind, but can also resonate in a thumping manner.

3) Is this a 4 wheel drive truck? Your transfer case and axles may make some noise.

4) your drive shaft make make this noise.

Have a good inspection performed - should be fairly easy to see the noise in action under the correct environment. Have a qualified technician help you.
Click that link for some techs near you!
Thanks for this response. I changed the front drivers side tire and sure enough...the noise went away. This saved me from some costly repairs. Thanks so much for your help and guidance. (BTW- the noise was initially attributed to faulty outer tie rods. So I went ahead with the repair. I wonder if I actually needed that $300+ expense...) Thanks again.
I have a mechanic that says it is my rear deferential? I bought a new one and have the same thump should I try one of these methods?
1 more answer
Sounds like mine. My mechanics are doing the rear end differential. Try that!