The Allison will NOT fit in the new GMT-900 'Burb, without a body lift of some sort. It was in the latest Truck Trend mag. (if you can believe them)

GM needs to get off their rears and get a Diesel in the 1500 pickups and the tahoe/'burb lineup. It needs to be capable of 25+mpg and they won't be able to build enough of them. I heard the new 6 speed auto in the Escalades are really nice.....