you need a gear puller if you decide to swap for the lowering keys. you dont have to replace them though if you only want like 1" they have some play to them

i had an 02 4wd and used f150 keys to lift it... bad idea, cvs are on a terrible angle.. probs just kept happenin one after another, i would suggest NOT putting the lowering keys on, but this is only from my experience of doing the LIFT keys so it might be different

as far as the blocks i coudlnt see why they would be a problem, shackles would do the job to, youll probably get the same distance outta both only diff is shackles will probalby be about $60 wit shippin and handlin.... ubolts probalby $30 wit shippin in handlin so you do the math

if you feel some vibration after you do either the shackles or block delete w/e it is that you decide throw some 2.5* shims in there