help/info/links for driveshaft alignment? [5kcstq]

[Ken]

Hello,

On the way back from Laughlin (to Phoenix), my '88 5kcstq demonstrates a vibration which I attribute to the driveshaft.

I just had it all apart to do the clutch, and I did include the metal spacers (one thick one on each side) at the center support bracket.

I centered the bracket/housing in the tunnel, using my fingers between the two on each side.  Apparently that wasn't right.

I scribed marks around the original location before removing anything, but they weren't that helpful for whatever reason.  I would like to find a way to align it based on the driveshafts halves relationships to each other (unless there is a better or easier way).

What kind of techniques, methods, or tools have been used to accomplish aligning the driveshaft?

Thanks,

Ken