I know this is going to be hard to pin point via the internet...but wondering if anyone had any ideas. I had a new(used) front differential put in. Drove great for about a week. Was fine this morning also. I went to go out to eat about 2 hours ago, and now i'm getting a rough dry feeling...only when I accelerate from a dead stop. Once it's going it feels fine. I just got home, so I have not checked to make sure the mechanic actually put any fluid in...plus I just moved and have no idea where my tools are packed. Just looking for any ideas someone may have to check.