Posi or not I think it's not. - Ford Powerstroke Diesel Forum
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Old 09-08-2012, 08:31 AM
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Posi or not I think it's not.

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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Old 09-08-2012, 03:49 PM
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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:

limited slip my butt!!

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.


Last edited by 03silvertj; 09-08-2012 at 05:32 PM.
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