4" is just the begining, try alcan spring. www.alcanspring.com I have a sprung under FJ40 with 7" of lift, they make custom springs for any application ($450 for 2, $900 for all 4) And they flex like mad too! <IMG SRC="smilies/biggrin.gif" border="0">
P.S. Hey Nolen post one of your axle artic shots here.
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