I took my Liberty in for Monday to get the rear pinion seal replaced since it was leaking (194k!) and got it back, no issues. Drove about 200 miles since then. Today it started making this noise that sounded like a spoon or something got caught in a rear tire, after about 10 miles it got super loud. I noticed when I let off the guess is when the sound happened, on the gas it was quiet so figure it's rear diff related. (nothing in the tires obviously). I dropped it back off at the shop tonight so he can look at it tomorrow. Any ideas on what it could be? The driveshaft felt normal going into the diff and I didn't see anything obviously wrong.