yeah i run the 150 ttb coils since the mid 90's in the rangers, usually with the v8 swaps.
spring shops all said it wouldnt work. or i would probably been doing it alot sooner.
the spring from the van will be stiffer. due to the lever effect of the tib of the oem van. you could buy some quigley spec coils, but i think they just use the oem coil...which is why i suggested it.
on edit, there is nothing fine about my hacked up hideous pos ranger. you just have to trust me on this one