vibration?

I have a 94 4runner 4wd. I have been getting a high speed vibration around 75+ on my truck. I have had the tires rotated, balanced and replaced the idler arm. The tires are pretty new. It still does it, but not as bad. Anyone have any suggestions? Thanks

I had the same problem a few years back and I have the same year 4Runner
Turned out it was a broken bolt on my front skid plate under the engine, The Huge Sucker that goes right up to your front bumper.
Check it out, only takes a few minutes and won't hurt anything.

Good Luck.
OzzyO :smokin:

It might be a U-joint too.
Is the sound/vibration in anyway related to your foot being on the accelerator? If you take your foot off and coast, does the vibration minimize?

Yeah as soon as i take my foot off of the pedal, it stops. I bought this thing with a after market exhaust, so i think it might be that. I started to drive it around with O/D off, and it doesnt do it so bad. I took my skid plate off a few weeks ago to do some maintainence, and havent put it back on.

If you have an uneven wear pattern on your tires due to under or over inflation that might cause it as well.

Had the same problem here to except on a 2wd 98. Turned out to be the fwd U joint. The vibration came on gradually around 45-50 and increased accordingly under load, decrease when I took my foot off the accelerator too. Never made a sound either. Had it replaced and the whole vehicle is running more smoothly than ever. When I looked at it myself I didn't see any real visible indicator that the U joint was bad but got a good look after it had been changed. Good Luck!

whats the size of your tires? may be they are to big and not built for high speeds.