Join Date: Dec 2014
Location: East Meadow, NY
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
If 4WD - system: QD-II
Current Mileage: 120000
Judging by the looks of the setups, not by personal experience, the stress would be greater on downward travel of the joint.
Lifting it puts it in an angle which is not the normal rest position. Then you add in that most are lifting for a bigger tire, which will be a lot heavier.
That combo alone, angle+more weight, will lead to eventual failure... Eventual really depends on how you are driving it. I play on the rocks, so I have upgraded the ball joints when I bought the Jeep By Al upper control arms. I have upgraded them again by getting the new version of his ball joint which allows for just a tad more angle and is beefier.
If you are a street driver, with occasional trail, I would not worry as much if the original equipment is in good shape.
'06 Hemi Limited 4X4, 6(ish)" lift, 35" General Red Letter, 2" spacers, Mopar CAI, RER and mygig lockpick, blue Interior LEDs, stub antenna 3", Callahan Red Brake set, 6.1L SRT8 exaust headers, full custom 3" exhaust from headers back, Fastman 847 ported TB, BBK Fuel Rails, 6.1L injectors, JBA UCAs, Nitro gear 4:10, SA hidden front winch mount.