So I took my truck to the dealership today for inspection and it failed because the pitman arm and idler arm have excessive play/worn. The truck is a 2006 2500HD Dmax with 49724mi on it. Its used for plowing and they said that might be what caused them to go bad and recommended that I not go with the stock parts and go with aftermarket instead and try to get heavier parts because of the plow being on there in the winter. The price they gave me for the Idler arm kit is $219.08. The price for the pitman arm is $130.02. I need to know where I can get heavier parts for my truck and about how much they're going to cost. I'm going to do research as well but help would be greatly appreciated! Thanks!