I bought my truck from Derrick and they told me that i couldnt even put the leveling kit on without voiding the warranty, so i asked how they sold trucks with lifts on them already for 60-70,000 with no warranty and they told me that they would send the costumer back to the place that installed the lift for them lol. Anyway i recently took my truck to them thinking the balljoints were gone and they covered it under warranty even though the front end was crossed off the warranty papers when i bought the truck, he said it was due to having the gold plan for warranty, i also have alot of friends that have lifts and they havent had any problems with warranty. Hope this helps a little
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06 5.9, 6in lift, 17 in moto metalrims with 35 in trxus sts, stock 4 in minus the muffler and the cat, bushwacker flares, bull bar, ryno liner, AFE stage 2, silencer ring and way to much to come