Help... I have an '08 with leaky rear axle seals, again. Dealer replaced last year and it's started again, both sides. Has anyone had these seals fixed successfully? I read old posts on the topic and the only resolution I've seen is some had the entire differential replaced. Took to dealer yesterday and waiting for parts. He said they had to open it up to determine whether it's just the seals installed wrong or nicked or something else like a cracked case. For those who got the differential replaced - did you simply request it and they complied, or did dealer do it on their own, or did you threaten to go up the corporate chain? Am getting frustrated because this will be the third set of seals. Can anyone point me to how they diagnose the leak - I read a post where someone said they is no diagnostic section on the rear diff. in the FSM hence the reason they replace the whole thing. Thanks for listening to my rant. Other than this, I love the truck. No other problems. I just don't want a patch job done and get stuck with a huge bill since I only have another 1.5 yrs left on the warranty. Thanks.