I'm no expert, but I have the same truck. I think It depends on what your gears are 4.10 or 3.42. This Information can be found in your glove box mixed in with of those codes on a sticker in there. If you have a GU6, this means you have 3.42 gears. If you have a GT5 then you have 4.10 gears. The owners manual says 3.42 gears can pull 7400lbs and 4.10 gears can pull 8400lbs. You should double check this information with your dealer before towing, but looking around on the internet that's what I've determined.
Max towing capacity for the 2005 GMC Sierra 1500, V8, Regular Cab, SLE 2 WD is 6300 lbs.
Got the info straight from GM; 2005 Sierra 1500 5.3L Crewcab shortbox 3.73 axle ratio 4x4 is rated at 7400lbs towing capacity.
Your manual should tell you. My 2005 has a towing capacity of 1500 lbs.
mmcda
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1500 lb
9000 pounds