Used drive shaft installation?

[a1parrothead]

I am buying a good, used rear drive shaft for my 1996 4runner (long story). Anyway, do I have to worry about it being out of balance? In the past when I have replaced U-joints etc., I have always marked things so it went back on the way it came off. But, obviously, with a used one from another vehicle I have no way of knowing. Is it trial and error? Do I put it on, see if it vibrates, then take it off and rotate it? Any input would be great.
Thanks, Jeff

 

[hodgepodge79]

BUMP.

Are there any Do It Yourself tricks for balancing a driveshaft?

 

[hossmaster]

I don't think that the position you take put the driveshaft on really matters for balancing. It's the same as your tires. It spins, so there is a weight on the shaft that opposes the heavy side of the shaft so it doesn't wobble. If it vibrates, you can take it to a driveshaft shop and have them balance it. While it's out, might as well put new u-joints in it, so you won't have to worry about their quality.