yeah ford did. my 02 f350 dually 2wd came with a 4.10 posi from the factory and the vin number confirms it. my 95 f250 2wd came with a 4.10 posi from the factory and the window sticker and vin confirm it , bought it new. my 06 60 f350 dually 2wd came with a 4.10 posi , bought it new. my 01 f350 2wd dually came with 3.73 single leg from the factory and i had a factory posi and 4.30 put in it. I had them clutch stack the posi tight.Came without it. As I understand, Ford didn't put a limited slip in the 2 wheel drives.
I have a Detroit locker in the rear of mine and it works fine on the street, I tow with it all the time.I would only run a non selectable locker in a more off-road style rig. My desert truck had one for a long time, didn't hate it on the street, but you know it's there and it likes to remind you. I wouldn't want that in my tow rig. I would definitely do some type of limited slip setup.
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I have a selectable locking rear end on my Ford Sterling rear end. I have a Eaton True Trac on my front end since I have Eaton Dana axle in the front. They work well together. I also have a winch on the nose.My 2000 F250 has a swd and I tow a 12,500 5th wheel. I am a little concerned about getting stuck since only one wheel grabs. Has anyone installed a locker or posi-trac unit in their swd? If so, what are y'alls recommendations? Should I even be concerned?