[SCOTI]

It's hard to answer 100% accurately since a 2/4 drop is possibly different from truck to truck (2/4 drop from stock, from where it was, etc...). The best way to know is to do some basic measuring & determine what your needs are. Take some measurements of shock length (eye to eye) @ ride height. Then remove them, measuring for fully compressed, & fully extended heights.

You'll get pretty decent ride quality & shock travel w/about 2-2.5" minimum travel up/down. Compare your ride height shock dimension w/the 2" min need & see what the tape measure says.

Example: Lets say the hypothetical truck has....
Front shock length @ ride height = 13"
Front shock fully extended = 17"
Front shock fully compressed = 10"

13" + 2" = 15" for decent expansion w/o over extending & it's less than the max @ 17".

13" - 2.5" = 10.5" for decent compression w/o bottoming & there's still .500" before the shock bottoms out.

With something like this, there's no need for relocating mounts or 'custom' drop shocks. The rear would be done in the same fashion.