Umm on that set...maybe 15-20K. Not many, when i put on my original leveling kit a couple years ago we over tightened...something that correlates with the ball joints(you can tell how little i understand this stuff). And a few months down the road the right one went out while going down the highway. Well, i put this lift on in...february i think, maybe march, anyway right about the same amount of time, and the right one is about shot and the left ones working toward it
on my old truck the original ball joints didn't go out until 150k and that's cause i was hard on them but you just never know how long they will last. my current truck has 102k and they are still good, but you never know.
I guess I need to have em checked to be safe. I'm sure a shop's gonna tell me they need it even if they don't.
Check them ur self. Wen I put my lift on, one of my balljoints fell out! It was broke into 2 pieces. Sent from my SCH-I500 using Tapatalk