I've been trying to get to the bottom of this problem for over two years now. The vibration is moderate at highway speeds and I can feel it in the steering wheel. The clunking is noticeable at parking lot speeds when the ground is bumpy. I'm not sure if they're related but I'm looking for ideas. I replaced almost everything I can think of, in this order:
- All front lower control arms
- Brake rotors & pads
- Wheels and tires
- All front upper control arms
- Both front wheel bearings
I've verified that the top two steering rack bolts are tight. Nothing amiss from a visual inspection.
The vibration has improved stepwise with some of the parts replacements. The single biggest difference was the brake rotors, which cured the vibration under braking which was the original symptom (and may have led to the loosening or failure of whatever I'm dealing with now.) The RF wheel bearing and the RF straight lower control arm also made a noticeable difference
Any suggestions? I'm tempted to replace the tie rod ends, but the steering is tight and it seems unlikely that they would only get loose at high speed.
Subframe bushings maybe?