'04 Pete 387 - Not quite sure about it

That's EVERY Peterbilt.

 

Sounds like a money pit. Unless you have a good mechanic and they're using IDP parts you're looking at a $25,000 inframe at a CAT house or some such. Not to mention a gazillion other things that are likely going to need attention. Did they slap a cheap set of shoes and drums on or did they check everything and do it right? Because if they did a slap together job you'll be doing all that over again sooner than you ought to be.