I have a 91 4runner 4x4,3.0, auto trans. When I put it in to (D)drive it jumps forward. then when I drive, it shifts hard, then when it goes in 3rd it doesn't want to shift anymore just goes up on the rpms. Went to have it put on the computer to see what was wrong? they said it wasn't the trans. might be the transfer case. SO I looked at it again. put it in to 4Lo and saw the front drive shaft move took it out of 4Lo drive shaft didn't move. And the 4runner has auto hubs. So don't know where to go from here. thanks