Hey guys!!! Kinda new here but have done a lot

Of reading... I see a bunch of
People saying the rear diff only locks it 4x4 mode
Even on the fx... And that only the raptor locks the diff in 2hi.

Heres the thing my 2012 fx4 screw 5.5 3.73 rear, 5.0l does lock at 2hi but it comes off at 50km/h (31mph)... Why is it that mine does go on and others not, just curious defs not complaining ... Thanks guys

Cheers!

 

Mine 12 fx4 is the same way

 

My 13 as well, I think the 2wd thing was for the 2011 model

 

Same here... 2013

 

yeah after 2011 they lock in 2 wheel drive.

 

I believe,and from my understanding, in 2012 they had included that function.

 

Mine in my 2012 too. But doesnt it engage and disengage up to 20 mph? I think I read that on my display.
Also anyone, whats the point? I noticed it sucks on pavement, sucks on ice, all it does is make the rear end hop, so whats it for?

 

definatly not for pavement. it will work great in off road situations. mud stuff like that gives you traction to both wheels even if one is off the ground.

 

Thats weird... I think its great. Maybe you think it sucks because you have traction control on when you are trying to use it. Its not going to work how a locked diff should when that is on. When I am out offroading i turn advancetrac off and then put the rear diff lock on when needed in 2wd. Works awesome. Then, if needed, put it to 4wd.

 

Its great for offroad! when not in 4x4. Also straight line launches i think it helps a lil bit?