I wanted to go back to part time after going driving full time for 2 years. However, I wasn't able to step down. Apparently, the only way to go back to part time was to quit and be rehired. If I were to be rehired, is there anything in the contract that states I get to keep my company seniority ( pay, vacation, etc)? I worked at UPS for 7 years, 5 as part time (vested.) My reasons for deciding to going back to part time are personal.