We bought a 1995 3/4 ton 4x4, with the 454. I'm pretty sure it has 4:10 gears, but i've not counted them. i tow a '76 31 ft sovereign
, and it seems to do pretty good. I had 8 ppl (4 adults, 4 kids) full of fresh water and gear for a 2 night trip, and was able to pull Snoqualmie pass here in Washington at 50 mph. Not sure what kind of milage i'm getting with it, because we've only had the trailer for 2 campouts, but solo is about 12 on the highway. we love our suburban, mostly cuz i don't like taking more than one car when i go on vacation. It's almost a bus!