Hey all, Currently looking at buying an xr6t, found a really good one but has two faults. He has the urethane bushes in the car, and he said when he slows down he sometimes hears a thump. Would this be the urathane bushes as they are really rigid? Also, it has new diff gears, etc, but a dyno place found that the rear diff mount is cracked. How severe is this? Thanks