Have a problem on my 01 Alty and was wondering if anyone has experienced it themselves.

It is a bad vibration. Bad enough you can see (or hear things) shaking inside the cabin starting around 50, 55 mph. The odd thing is it only occurs under load and varies according to the load. Give it a little bit of gas, it shakes a little. Give it a lot of gas, it shakes a lot. But as soon as you left off the gas, it's gone. Completely.

It started right after I replaced a slew of parts, all new, all aftermarket, all in the same shared_session. All four struts, front strut mounts, front rotors and pads and the driveshafts (new aftermarket, not reman aftermarket). I did notice a slight vibration around 50 then but did not take it above those speeds before I did a second round of repairs (all new): all belts, both idler pulleys, passenger's top motor mount, plugs, air filter, oil change. Again I can't say for sure when the massive vibration started but there was some noticeable vibration there at least after the first round of repair.

I've had the wheels balanced, rotated several times, alignment done twice and it's still there. Before I did the first round of repairs there was no vibration at all. Not only is this really annoying, I'm afraid as bad as it shakes something it going to shake somethin loose. What has me perpelexed is why is it only under load?

One thing I did notice multiple times when I went on vacation in the mountains is that when I was going up a big banked curve (can't remember which way, possibly when the curve went to the right), even under load, the vibration lessened considerably.

Has anyone else experienced this? If so how did you resolve it?

Thanks!
Sg