My 89 has the four speed stick. Lately (last 6 months or so) when I come off the clutch a little hard something comes up and hits the floor pretty hard. Looks like it could be the transfer case itself. Since the tranny and transfer case mounts typically use gravity and don't prevent the drive train from rising, could it be a motor mount? It doesn't seem likely, but I'm running out of ideas. Anyone seen this before?