Getting ready for summer towing and I'm going to change my differential oil. Is there an easy way to pry the stock cover off once I've removed the bolts without damaging the cover? The metal it's made of looks awful thin and I'd hate to bend or warp it cause then it might leak on down the road. The first time I changed it I just siphoned it all out @5k and replaced it w/amsoil 75/140. Now,@ 65k I want to do a complete drain and check for any wear metals.