Auto transmission issues!

[CrisB]

Uh oh...I think it's baked. Slipping gears down the highway, while towing my normal load of quads & dirtbikes up to the cabin. She can't pick out which gear to be in, keeps switching from 4 to 3, sometimes to 2 & revving up over 6k. Checked the dipstick, low level...got underneath & I see blowback coming out of the transmisson breather tube all over the bottom of the truck. Made it back home ok (150 mi!), kept it topped off. Slow in my 'hood, I can hear bad sounds down there...never heard of this one.

Here's the kicker...50k warranty on the early build '06, its at 52998...anybody go that phone# for Hummer warranty dept so I can do my best to bitch up a storm?