Was running good then just stopped I think it pulls better when I lift rear up. When I lift front up just spins doesn't wanna push...took covers off center spool an everything is meshed together no sign of wear..thoughts! ? Am a little nervous about taking apart diffs...I grease them by drilling small hole in top put wolf's head read grease in them a dab of hot glue to cover..works great.just nervous about taking diffs apart