Hi there, I currently have a rusty's lift on my 2005 Liberty but after a few years and some sagging I feel like it's time for an upgrade.
After plenty of research I'm leaning towards the Frankenlift 2 premium and then possibly adding the JBA upper a-arms. Any advice would be welcome, but one question that I need answered is if I were to order the jba a-arms do I need them for both the front and the back? Thanks in advance for your advice.

Frankenlift is a good lift, already preassembled so easy to install.
Yes you need the JBA UCAs in front for sure since its over the height where stock arms are limited.
For the rear JBA also makes an extension for the rear tri link to get it back somewhere close to original location.
I'm really surprised you got a few years out of the Rustys lift.
I installed one several years back on a friends and it started sagging with in a few months.
Only one I installed and have over 35 KJ lifts

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited