95 E300 Diesel hard shifting

[pdvoracek]

I just bought a 95 E300 Diesel. 220k miles. Was shifting beautifully when I had the tensioner spring for the serpentine belt replaced. When I took it home it had a very hard shift to 2nd 3rd and 4th. A guy I work with suggested maybe the repair shop pulled loose a vacuum line. Is there anything up front they could have knocked loose to cause this hard shifting. If not what else could have caused it. I wanted to get some ideas before I hear back with the shops diagnosis.