My son has just purchased a lift kit for his truck. We are going to start putting it on tonight. The main reason he's rushing to put the lift kit on is due to already needing some new control arms and bushings, rather than buy the stock ones then replace them with stock then just swapping hem out again with the lift kit he's just one and doneing it. The lift kit says not to use stock tires. The truck is on 20's stock, and he is planning on getting bigger tires on it but was wanting to wait to try to find what he wanted as well as see what would fit well after it is lifted. Does anyone know why you shouldn't run stock tires on a lifted truck? is this just a sales gimmick?