1999 Chevy Blazer, Vibration over 65 MPH

[quote:b11c2870ef="Lonnie92071"]I have a 1999 Chevy s-10 blazer. 90,000 miles, 4X4, automatic transmission. Runs and drives great, up to about 65 mph, when I get a very very noticeable vibration. Can't really tell if it is coming from a specific area or not, just kind of feels like the whole thing is shaking!. I tried swapping out wheels/tires from a friend's blazer and the vibration is still there. Any suggestions? I am on a limited budget, so I want to know the best thing to try first before spending dollar after dollar guessing what it might be.[/quote:b11c2870ef]you might want to look at the engine and trans mounts closely.make sure they are not broken,collapsed,or excessively "spongey" from oil saturation.You could also find a shop that has an ELECTRONIC VIBRATION ANALYZER. The E.V.A. can pinpoint the source of vibrations by measuring their frequency.

Try removing the forward drive shaft. It worked for me but I haven't determined what the true source of the problem is so I can re-install the drive shaft. The problem was the u-joint at the forward end of the drive shaft.

Check the drive shaft, I had the same problem and the vibration got so bad I thought parts were going to fall off, it ended up being the U joint on the back end of the drive shaft.