well, i expected it, but not nearly this soon. the suburban lasted two years on the stock tranny, and i dogged the hell out of that too. racing all the time, 6k shifts all the time. maybe the suburbans have a better tranny cooler. but last night i ordered monster transmissions best tranny, good for 650hp, a 2500 stall and a 13500 gvwr trans cooler. and today my detroit truetrac came in, so when i get her all done she shoud be all kinds of nasty.