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I looked at me original window sticker on this website and it says 3:73 limited slip rear axle that is not a posi is it? Also can you change it to a posi if it's not? I was spinning in some damp grass I a slight hill but only the passenger rear tire was


2008 F-350 CCLB all stock for now... Deleting and tuning with Vivian's looney street soon.
 

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Your truck probably did come with a posi, but from the factory they are very weak. There are a lot of things you can do to help. There is in fact a great thread going on this minute in the 6.4L general forum:

http://www.powerstroke.org/forum/general-6-4l-discussion/267392-limited-slip-my-butt.html

You can change the fluid and not add the friction modifier, take it to a diff shop where they can add/adjust clutch packs, or replace the unit entirely. There are a lot of threads with a lot of good info.

Kyle
 
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