Truck shaking after a hanger bearing replacement.

Shaking how? Like rear wheel shake, drive line shake? Where do you feel the shake?

 

What did the shop tell you?

 

Look at the driveshaft, make sure a balancing weight didn't fall off.

 

Probably didn't get the new hanger positioned in the right spot.

 

Driveshaft is probably out of phase or assembled different from before. Remove entire assembly phase and balance.

Always mark driveline pieces before disassembly, no mistake it will be the same when going back together.

One of my big pet peeves, tow drivers never mark drive shafts.

 

To make it even more complicated, some come from the factory out of phase. Mark before you pull the yoke, I usually use punch marks that way cleaning process doesn't remove your marks.