By the way, you may want to have someone take a look at the brackets where the trackbar mounts up to. Hitting the diff cover may have put the trackbar in a bind and damaged them. Doublecheck the bolts with a torque wrench too.
One other helpful hint. Pics that are around 100kb-150kb are much easier to look at on the board.

 

I would recheck everything they did.

 

Just redneck it and bash the cover in with a BFH.

 

The shop put the track bar on Bassakward !!! Flip to the right Direction and you should not have any problems!!!!

 

I may be paranoid but I would double check everything they did like ryanc said.

 

simply ridiculous. as mentioned, reinstall it correctly and check everything else they worked on - just in case.