You'll need to measure your shocks. For the 3.5" lift, RK recommends:
Front Shock Recommendation with 2" bump stops - 16" Collapsed to 27" Extended
Rear Shock Recommendation with 2 " bump stops - 16" Collapsed to 26" Extended
At 3.5", you should also have at minimum:
Adjustable front track bar
Adjustable front lower control arms
Adjustable rear lower control arms
Front and rear long travel stainless steel brake lines
Also be aware of drive shaft angles