Originally Posted by greddy25

Hello everyone. I'm looking at getting a few ideas to keep troubleshooting a strange sound coming from what I believe to be the front wheels. My car is a 2002 2WD TR4. Here's a quick run down of what's been going on and what I've done so far:

At around 30mph a humming/tire noise starts picking up and gets louder up until 60 where it slowly gets less noticeable as I increase speed. I can put the car in neutral while coasting and the sounds doesn't go away. It's also not dependent on load since the sound doesn't differ by how much I accelerate or tow. It also doesn't vary if I'm turning in either direction. It's definitely speed dependent.

So far I've greased the u-joints and switched out the rear diff fluid which looked pretty good with very few metal flakes on the plug magnet.

I also checked the pinion bearing by putting the car in neutral and there was no play whatsoever. Lastly, I put the car on jack stands and accelerated to around about 55-65mph and there was no noise either.

After all of this, I'm pretty convinced that it's something in the front especially since I noticed yesterday that the front tires have a bit of uneven wear. Nothing insane or noticeable if your not looking for it but definitely there.

I haven't taken the car for an alignment in a while and at higher speeds it shakes a bit, but could being misaligned lead to this kind of noise?

Originally Posted by Dieselchessy

Rotors warped, wheel bearings, tires, alignment, bushings shot, tie rods, ball joints......