75,000 miles on my '03 Chevy 2500HD, and the cover on the rear differential fell apart from rust......just the cover. A cover that is oil filled on the inside. A cover that OUGHT to outlast even the seat belt "ding ding dinger", which as everyone knows, will be working fine 50 years after a truck goes to the junkyard. Rest of the underneath is fine. Cover was falling apart in big hunks and slices. Fortunately, Chevy makes a "kit" ( cover, gasket, bolts ) to fix it. Yeah, a "kit"......think they don't know they bought a boatload of crappy differential covers that were made from chitmetal from some subcontractor ? Think Chevy would even consider standing behind something that was an obvious problem ? You'd be wrong. Fortunately, the paint is still on the truck. My previous Ford, paint came off in sheets in about 3 years......not even bonded to the primer ( which WAS bonded on the bare metal quite nicely ). You could drop ( and not press down ) a piece of tape on the truck body, pull it up and a whole strip of paint the width of the tape would come with it. 100 frigging years in the auto business and don't know how to paint a truck. You think Ford stood behind that ? You'd be wrong ( and why I didn't even go on a Ford lot when I went truck shopping in '03 ) Yeah.....buy American......bring your own vasoline.