I think your Teraflex springs are much more heavy duty than my Rough Country springs. I'm prob netting a little less than you even at 4" coils. You're prob getting a bit over 3" with those 2.5" HD springs...

 

Actually I ditched the front tf springs for rk springs, the teraflex springs started to sag a lot and they were onle a few months old. The rk springs are 1in taller compared to the tf and they don't sag at all so far. Plus I have the same up travel with the rk springs and an extra 1.75" bumpstop comped to the tf springs and on the factory bumpstop

 

Just follow the directions and you will be fine. The taller the body lift, the more small details you need to address.