My appologies for leaving out the details .....
My 2005 Sport is a 2WD V8 with 1,200miles on it now. The vibration is felt at highway speeds - 50 to 65 range. I havn't had it over 65 yet. The vibration can be felt really only in the steering wheel. I also can see the steering wheel shake.
I'm inclined to think this is not a wheel balance problem. The dealer balanced the wheels once with the cone and again using the special lug-centric adapter. They also swapped tires/rims from another 4runner as a test so I really don't think this is a wheel/tire problem.
I have a feeling that this problem has something to do with the actual steering mechanism. Perhaps there is a design flaw with the rack and pinion, hydrolics, etc.
This board and others on the web have an abundance of postings about vibration-related problems. Also, I contacted the - Attorney General's Office here in Florida and was told that 12 4Runners were bought back by Toyota in 2003 and 2004 alone!
They could not tell me why but I have a feeling they are related to or include this problem.
It is a shame because the 4Runner is an otherwise exceptional vehicle. I hope they resolve the problem because I really don't like the alternertive solution of them buying it back. I guess I would then buy my second choice - the Honda Pilot - nice vehicle but not as sporty.
Sorry for the long posting and thanks for everyone's concern and feedback!!
- Anthony