You should do new shocks front and rear for 3" of lift.
LCAs'll be fine, but could use changing.
You need to do something else for the rear besides shackles. At 2.25", I have issues with my driveshaft over-compressing into the t-case. An Add-A-Leaf is your cheapest/best bet. Next option would be a bastard leaf pack. Either of those 2 options can be combined with a maximum of a 2" lift shackle.