ya they have it for the 4
depends on what u get, the main thing you would get is the under drive pulley, but u can get the whole pack which frees up power and gives u an increase in mpg
here is how to for 3 and the whole pack u can get
http://www.ranger forums .com/f59/ho...e-pulley-9112/
holy shit a 4l under drive pulley is 250, a 3l is 70 :O