i only plan on going 2-3 inches, how bad will this kill my front cv shafts and driveshaft u-joints? how much life will I kill from the drivetrain by doing the lift?

Thanks in advanced

Not a KK but KJs are close
so with over 182,000 on the KJ (and over 160,000 miles lifted at 4 plus inches) my left side is needing replaced now, its still original yet. Right side has been replaced once when the intermediate shaft and the CV wore out.
Rear U-Joints were replaced with greaseable around 55,000 miles
That may help you some As always they are all wear items so some maybe replaced sooner / some later all depends
But don't let that stop you from lifting, no matter what its worth it

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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

sorry i meant KK, i have a 2012. are the KKs better designed for that kinda stuff? anyone go through this stuff on a lifted kk?

Sorry ?
But if you look KJs and KKs are the same pretty much in the front
same springs / shocks etc to lift it
Sorry I tried to help

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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

If your looking for numbers, then subtract 10 to 20 percent service life from the items listed

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2008 KK Liberty Sport NIGHT OPS EDITION + GILLS
OEM & Custom Skids - Factory Tow Package - Rock Lizard Skink Super Sliders
Prototype JBA 4 Inch Lift - JBA UCA's - Flowmaster Super 44 OR - Whacked Resonator
Jet Stage 2 - RL Gecko Basket Rack - Custom Winch Bumper - Recon 10.5K Winch