besel53

Ok. Totaled out my 2003 FX4 with a limited slip rear end a month ago, so I bought my dad's 2004 4x4 Lariat, but it needs some work, (shocks, ex. manifold, tires, etc. which I am working on now.

I also realized it has the 3.73 non-limited slip rear end in it (usually an f-250 rear end), and am not excited about 2 wheel drive traction in the winter. Has anyone changed out their rear end to a LS rear end? And how hard is it? Did a little quick research, and it looks like you can get an Auburn LS diff for roughly $500, but I'm wondering if I do some junkyard searching for a LS 3.73. OR does it even matter what the gear ratio is from the junkyard...cause I suppose I could just swap the gear with the one I already have? What do I need to look for from a junkyard?

Or is it easier to just buy a whole rear end from a salvage yard? I know I would have to stay with a 3.73 because that is what the front end would be, right?

Or should I not even bother...

hld247

Have no experience in swapping rear diffs but Motorz on Youtube has a pretty good instructional video.

techrep

iTrader: (1)

Just remember..whatever gear you end up with in the rear needs to match the front diff. (4X4)

besel53

Has anyone changed their one wheel wonder to a limited slip?

maxpat82

Thought about doing it on mine, but it would be kinda useless for me.
I don't drive much in winter.
When I lived in downtown montreal for a winter, I had no problem getting out of snow bank. shovel a bit and it was out....Just don't think you drive a 4x4 and you'll be good in 2wd..even with a non-ls,
LS can thend to slip more sideways then a non-ls (My 2wd LS ranger did that a lot compare to my 2wd non-ls f150.

jamie930

Limited slip would require a full rear end set and the cost with that.

I would use something like this http://www.powertrax.com/ No gear set up is require you just place the spider gears