From what i understand with the trailboss version, the lift kit that is installed comes with extended uca's to compensate for the lift (i could be wrong)You would absolutely need a new control arm. The UCA is a universal control arm for all 1500s. Since Chevy has taken their two inches, you would cause 4in of stress.
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The GM parts center website lists it as the same upper control arm for all 1500’s. But if you can find an actual comparison I would love to know! It seems to be extremely hard to find information like this. Hell, I still can’t even find information on which 10speed I have with my 5.3 LT lol
It doesn't show the uca's in the picture but it also doesn't list what comes in the kit84768243 - Performance, Suspension Lift Trail Boss, 4WD | All of our GM parts are new OEM parts. We offer a large inventory of OEM GM auto parts for your GM vehicle. Shop now and save.www.gmpartsstore.com