Because that ball joint angle is pretty extreme with the Expedition spindle. I would love to see if the F150's spindle/knuckle can be swapped in to alleviate that issue as it's pretty worrying to someone who's truck will spend some time off of the pavement. It would suck to be bouncing down a dirt road or through some snow drifts and have that ball joint fail. From the information we have dug up I think the 4WD F150 Spindle will fit on an Expedition. One thing I'm curious about is if the spindle swap alone will give any lift or if it will just correct the suspension angles once a spacer lift is installed.
I totally agree.
The bal joint angle, in offroad, is just a accident waiting to happen - That is why I spend so much time to get the information regarding the F-150..
I don’t see how the F-150 alone will give any lift. I think it will only change the Lower-to- Upper arms angle – the lift is a factor of the Lower arm –to-chassis length…
In any case, I think that the Rancho kit doesn’t address the ball joint angle problem either – it does the same way of lifting as the spacer ones.
Any way.
The other (next) concern/thing to think about, is how/if the higher spindle (if it fits…) and the change in the upper arm angle change, will affect the vehicle beaver – as the Upper and Lower arms will NOT be parallel any more or less parallel then stock…