..4-link??? help!

[TRAU 82]

hey guys...i've decided to go with a flip kit out back on my 82 swb and i'm at a bit of a stumbling block. this is where i'm hoping you guys can come in and shed some light: i've been doing much research and have noticed many 4-link setups being run, whether bagged or static dropped. i know a 4-link setup is is designed to prevent/limit axle roll...but is it CRITICAL/NECESSARY to do so when flipping the axle on top? or is it more of an added precaution? any help/advice you can offer is much appreciated...