Agh. I just bought this thing back in May. I've got about 18,000 miles on it. 2500HD, 4x2, diesel. Looks like the rear driveshaft seal or the diff housing is leaking.. anyone seen this before? It's not a bad leak, more seeping than anything else, but it's kind of concerning. Sure, it's under warranty, but if it's not gonna fix the leak for good, I figure I'll do the repair myself and find a way to fix it for good. Anyone have any experience with this? Any advice? And yes.. this is my first Chevy truck... why pay $44k for the Ram 3500 w/Cummins when I got this for several THOUSAND less?