04 ford excursion limited 6.0 diesel 4x4, i am doing a 4" lift with 4 new 4" lift leaf springs, can someone tell me what degree shims are recommended for the front and rear leaf springs. my leaf springs are arriving this week, i don't want to be taking the new leaf springs apart twice to add shims. please i need your help or suggestions, thanks.

 

Depends which springs and where the center pin is on them.
To do it correctly you need to have the front aligned to get the caster wher you want it and in the rear you need to measure with an an inclometer to get the pinion and tcase output in plane. No magic 1 size fits all number. You are designing and building a custom suspension and need to do the work to get it correct.

 

Ok, i understand, i do have an inclometer. thanks very much.