I know I haven't posted anything in awhile, and I hate to come back asking questions, but this one has got me stumped.
The tires on my Dak were getting pretty skinny and I had attributed my vibration problem to tires/alignment because it was pretty much chewing the outside edges off my tires. So I get new tires, get an alignment, and I still have a bad vibration. Its the worst when you get it to 50 or 55 the first time, but at any speed above 35 it rides pretty rough. I feel like I wasted $400

 

Check the U Joints.

 

Thats the thing tho, the vibration is not just in the rear but in the steering wheel as well.

 

They were balanced properly right?

 

I would assume so. I had this problem before I got the new tires put on and it definately has new weights on it now. For $22 a tire to mount and balance they better be right lol

 

Hah yeah I know what you mean. But it sounds more like your universals if it did it before and again after new tires were mounted and balanced.

 

Bad unaversal

 

I guess this is just one of those situations where I am different from everybody else. I can tackle an electrical problem like nobody's business but suspension and driveline...I'm usually totally lost. I'll give the U-joints a shot because this crap is driving me crazy

 

The u-joints are bad in my suburban and the whole truck has this annoying vibration. More pronounced in the seat but it's still in the steering wheel. With u-joints the entire truck will vibrate, not as if it were just a bad wheel balance. Do you know how to check the u-joints?

 

Could be an out of round tire. A u-joint vibration compared to a wheel/tire problem would be a much faster vibration. Could also be a bent drive shaft from an improperly placed lift arm at the garage - I've done it. Does the vibration seem to be the same as tire rotation or does it seem a lot faster? If your tires are new, you can drive down a gravel road and you'd probably pick up a rock in one of your tires. When you pull back onto a paved roadway you might be able to hear the rock hitting the road and get a good idea around 35 mph whether the vibration compares to the sound of the rock or if it's a lot faster. Sounds stupid, but I just got a new pair of Michelins and they usually sling a rock or 2 after driving in gravel. If it's faster it's probably a drive line component since they spin much faster than the tires do.