Wipers after windshield replacement

[xylorex]

I purchased a 2002 GMC 2500hd end of last year and had the windshield replaced shortly after because it was leaking.

ever since then my wipers seem to be off, as in they are banging on the bottom of the windshield each cycle. and probably not swinging up far as they should... i figure the morons at the glass shop didnt put something back right.

of course this drives me crazy. i plan on working on it tuesday since my office is closed for mardi gras, and was hoping someone might steer me in the right direction to fix this so i don't waste much time.

any input is much appreciated!