Right now I'm about to get into Local 447 IAM union at my Metro Phila. hub for working out in the yard. Was wondering if I decided later on to switch positions to inside the warehouse doing package handling, and switch to Teamsters, would I keep my seniority, benefits and pay increases? I'm just curious is all, as to what I could do in the future at UPS. I've heard I could stay in the same union and become a mechanic or truck driver at my hub though.