I bought a 2002 Suburban in May 07' with 96,000 miles. The dealer did their inspection - I'm guessing check fluids, ect. Before I bought I did a visual inspection and found the front axle seals were leaking. I talked with the dealer before I bought it and they agreed to replace the seals. All winter I used full time 4 twice, both times ice fishing, and have used auto only when streets were icy. The last time I went ice fishing (2 weeks ago) I put it full time 4 before I hit the ice and noticed a howling sound. I crawled underneith and noticed one of the seals was leaking again. I called the dealer and they said it would be covered under 12,000 mile warranty (now has 103,000 miles). I took it there yesterday and told them about the 4 wheel drive and they said they would look for problems while changing the seal. I got a call later and they said the front diff. needed an overhaul for $1200. My question is, shouldn't they have noticed anything the first time they changed the seals or when they did their used car inspection. What made them notice something now, they didn't even change the seal yet. What do you guys think.