atxz/28maro

iTrader: (2)

02 m6 z/28, My driveway is at a slight angle and I used to be able to park there with it in first gear fine, after a recent oil change (same oil/filter, and rechecked everything) my car slowly creeps down my driveway, if i walk out after about 20 minutes it will have creeped down to about halfway, what would cause this, is it normal?

I blew my rear end and replaced it recently, i couldn't get my e-brake to adjust right, so for about a month I haven't had an e-brake