My stock Badyears left me in a serious bind last winter. In order to get up my driveway, I'd have to burnout so much that I finally hit concrete instead of snow, then the car would start moving, then I'd have a buddy jump out and push it the rest of the way up otherwise it would just start sliding backwards. Oh, and my driveway is only a 10* incline.
Thanks for nothing Goodyear!