[Auto block on 2003?]

Hi guys, Just wanted to know if installing auto block on a non auto block is possible. I have a 2003 SE 4WD that came without auto block (or should it be LSD?) and its rear end is super loose, it thinks its a 350z on a pathfinder chassis and was wondering if it can be done 

[Hello from Lebanon]

Hi guys, I’ve owned a 2003 SE pathfinder for about 9 years and love this car. Joined the forums here to discuss ideas, recommendations and experiences about this beast of a car