i wouldnt attempt it if you dont have air tools.
if you have air tools and you dont know what your doing its gonna take you a minimum of 2 hours most likely. fronts are easy but rears can be a pain.
if you know what your doing........ you can change out all 4 springs in 30 minutes like me and soundxtreme did once
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joelsoundxtreme: u faggot
sweetnlow: takes one to know one
joelsoundxtreme: you know it cupcake