We just bought a 2016 used from a dealer who also put a leveling kit, wheels and tires on. Drove it around there but never at high speed so didn't notice the slack. Started to drive it home (7 hours away) and noticed the slack. Waited till we got back home and contacted dealership in our town, they got it in and repaired it per the TSB and under warranty. Have only had it back 1 day now and so far so good but no issues with it having a leveling kit and the wheels and tires. There is no reason that should void your warranty! Hope you were able to get something figured out. Hopefully this "fix" will work for us, if not, we will be taking it back in to be replaced instead of repaired.
