I own an 04 gp gt and I'm looking to sell it to buy a gp gtp. i found a guy who is selling an 04 gtp competition group with 103k miles on it. I was wondering with so many miles on it, and I've heard that at 150k the tranny starts to go, should i buy it? I take great care of my car and i know the guy who is selling it has taken great care of it. just some input? thanks.