Thanks for the suggestion's guys - I'll be finding out if it's the bearing soon, hopefully. ;)
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Weird vibration at 90-100 mph - doesn't exist with extra weight?!
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UPDATE
So, I did some more high speed driving this weekend.
Out on the highway, and some other roads - some pretty loud/can definately feel in da butt, vibrations at 90mph and up to about 105. Pretty damn apparent.
On the way back from the hills, I realized that at certain RPM's, at any speed, there's a slight...rattle that comes from the rear. Almost like the diff is loose or something, and it's noticeable at that given load range.
I got udnerneath the car this morning, and everything is tight. I thought it might be the diff loose or a loose halfshaft - everything is tight.
So, here's another idea. Maybe my diff is low on fluid? Maybe it leaked some when I first filled it, and it's not full?
My other, and most likely idea, is that one of my bearings only makes noise at a given RPM. However, I changed the load ever so slightly, and the noise changed. This leaded me to believe it was driveshaft related or something around teh diff. I'm really at a loss.
I'm pretty sure the driveshaft is good, but maybe my u-joint is goin or somethin.
Just wanted to throw this up there. ;)- Sean Hayes
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