Picked up a 05 sequoia 2wd. 187k on the clock. first timing belt was changed and getting second round under my ownership next week. During the initial test drive it didn't miss a beat. However i have now noticed a very aggrevating vibration in the front end. Google has come up with several possible issues ranging from the diff to wheel bearings. Definitely has a roar to it. Vibration is felt in the floorboard. Seems to do it more in lower speeds but haven't taken it on a trip yet. Anyone have any experience with this?