2.5° shims
RC T-Case Drop
with the new lift height, the super short stock driveshaft u-joints see big changes in angle compared to stock. This can cause vibrations and definitely wear them out faster, whereas in stock form, they rarely ever wear out at all, like 100K+ miles usually.
the RC springs come with 6° shims which tilts the axle way back and aims the pinion up at the transfer case. This is correct for an aftermarket driveshaft, but not for a stock driveshaft, so those need to be removed no matter what.
the transfer case drop kit is two spacer bars you install between the transfer case skid plate and the frame. It lowers the transfer case to help with angles and bring your driveline back closer to stock. It lowers it about an inch roughly. This changes the angle of the transfer case output to where it’s no longer parallel to the axle input (pinion yoke), so you then need to install 2.5° shims on the springs to be proper with your angles. The transfer case drop changes the transfer case angle by about 2-3°, so 2.5° shims correct the axle angle properly.
lifting a vehicle changes a lot of stuff. They don’t include a pitman arm but your steering feel will benefit greatly
From one too, and you either need to delete the front track bar or use a track bar relocation bracket. Get rid of the rear track bar.