when u put it in gear it does nothing but grind... in all gears.. doesnt move or anything.. when the trans was fine it would jerk me around the road (for the last couple of days it ran before i swapped it out) and if it helps when i had it on the lift both wheels spin.. no lsd tho lol maybe(A BIG MAYBE)(bc idk anything about that shit lol ) a bad trans axle idk (thing that bolts on to the back of the block)