That thing on the bottom that you can move in and out is the Basket Drive and Brake Assembly Part # 285792
You want to make sure it's pushed all the way up into the washer.
The other end of the Basket Drive attaches to the Drive Block Part # 389140
You should make sure the Drive Block is installed on the end of the Basket Drive correctly.
The end of the basket drive tube has two ears that line up with two notches inside the drive block.
Also make sure the large nut is tight that holds the basket onto the drive block.