I just bought a 1996 blazer with 120K on it for $1,700.
it vibrates pretty bad when taking off from a stand still and I hit the gas then let off and did it a few more times while on the interstate and could hear a clunking noise.
so, I figure it is the u-joints.
does this sound like that to you?
would this cause vibration when taking off from a standstill?
or (god forbid) do these trucks have rear end issues?

 

yup it sounds like the joints

ya might wanna crawl under and check for play in the shaft before it breaks and dose some serious damage

 

That could be a number of things aside from u joints. Bad front hub assemblies, brakes, loss of wheel weights.
Where does the vibration seem to come from?
Does it seem to be engine or drive train?
A clunking noise, from where?
Do you feel it in either peddle?

 

I just put it in park/reverse/drive and it "clunks" so I'm almost positive that's the issue.
its coming from the back/middle of the truck. are they hard to install? take off/put on is all right?
driving 65 perfect/no issues. just when I take off from a stop.

when I start it up, it seems to shake a bit (motor mounts)?