well i just came from dealer and they replaced leaf springs. still have noise not as bad as it was with 8k on old ones but still noticable. I will say dealer did everything they could, but gm is not giving any solutions to the problem, they are still same exact leaf as came on truck new- no redesign from ones they replaced. they have a lot of problems that i wish they would of fixed before they sent these trucks to the market. i dont like saying this but i should of stayed with toyota, they are way ahead of gm on many levels, but i just got caught up in the new bodystyle.