Why would it. 4 Link hold the axle perfect all the time. The springs are exactly the same, you are just alowing them to move forward as well as back.
I run my off-roader and the road all the time. After doing this mod the road manners got way better, no more wishy washy flat tire feel. Got to rember 10+ inches of lift and 40" tires.
It was just food for though for thoose worried about binding.
You are using the leaf springs on a 4 link to avoid swapping to coils?