So originally I thought just swap out the factory shocks, set the 5100s at 2.8 and you're good to go, riding better than stock. I've noticed a few people talking about replacing the UCAs as well... Is this necessary? If so, why?
This is not necessary, only a small population of people with a level on their trucks have had upper ball joints popping up ( 2013 &2014 ) I've not heard of a 15 with this issue ...
Maybe a 15 owner will chime in .
So you likely will be fine .
Installing a level with the Bilsteins is the prefered way verses spacers , due to the way it lifts and the stresses it puts on the system .
The 15 s uca and Balljoint may be of a diff design . Not sure .
I installed the Mevotech UCA'S for cheep insurance because I use my truck as a 4wd .
The problem a few has had is the Balljoint I n the uca migrating out through the top , you can just install the bills and keep.an eye on you ball joints!