I think the arguement for tierod upgrade also needs to take into account the offset of the wheels on the spindle. Like a seesaw when the spindle is centered in the wheel (split 50/50) very little force is required to change its position. The further out you move the weight/force (70/30) the greater force is needed to affect the object or even keep it straight. Once the wheels move out from the center of the spindle the tierods inherit the load due to leverage. I dont think the stock tie rods could survive for long with the 15.50 tires on a heavily offset rim. They might be fine on a truck with taller tires that retain the factory offset though. I also would like to say that Phil saved me a ton of money when modifying my truck and is one of the most respectable and helpful business people I have met. He even shipped an expensive item before I paid for it because he knew I needed it quickly as the truck was in pieces on the mechanics lift. 
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2004 Lux with 6 inch Fabtech with tie rods, 38 inch MT's, 4:88 gears, and some minor engine tweaks.
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