you will be fine, SS will sit lower thatw ill be your biggest issue, plenty o power and the AWD will be fine as well

I have a 2010 Sierra Denali with the AWD.... never had an issue. Its nice not having to put it in 4x4 to pull your boat out. I am a big AWD fan, i converted my 95 2500 suburban to awd during my 6.0 twin turbo swap. Nothing beats all around driveability of an AWD. Ever been in the rain in your pickup and make a turn from a stop and it spin? Yeah no more of that... there's plenty of hp and tq in the truck to not worry about the low 4x4 ratio.

If you aren't stuck on a Chevy search for a 08 & ^ Sierra Denali. More HP, 6spd 6L80E trans which is better than the 4L65E in the Silvy SS, and although the Silverado has the SS badge the Denali is quicker in the quarter.

Been there done that and got the T-shirt. Now don't get me wrong I did like the truck but keep in mind it was running a "not meant for towing" setup with Full Race Level 4 FLT trans and 3k stall and 2.3 whipple. My heavy IMP about 6k lbs is probably what your 27 weights??? I sold mine because I had a hard time towing but again wasn't meant for it. Although it ran great and had enough power to do complete AWD circle burnouts. I demoded it and sold it to buy my 2013 with 6.2! Fun truck non the less but there value has come down big time in the past years. And the Denali is faster. haha good luck. I'd stick with the 08 if it was me. Ex. I sold mine with 67K for $14K. And it was an 03 and MINT.

Thanks guys for all the input. I was going to trade but couldn't work out the deal I wanted. I'll keep mine for a while and get something later.