I've been trying to get rid of my drive line vibrations and think the next step is to try a one piece drive shaft.
The first thing I tried was to drop the carrier bearing. This helped reduce the severity of the vibrations but I still had vibrations at ~20mph.
The next thing I tried was to put 3 deg shims in under the leafs, which moved the vibrations from ~20mph to down to ~5mph and I only get the vibrations when I take off from a complete stop.
I'm thinking I could try a different shim angle, but I don't want to be taking a stab in the dark in hopes it will work. Dropping the springs and putting in a new shim in isn't that difficult, but it's still enough of a pita for a shot in the dark.
So my next thought is to go down the road of a one piece drive shaft. I came across Mesa Drive Shafts (http://www.mesadriveshaft.com/) and was wondering if anyone had experience with them or had a recommendation to another shop.