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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.

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12y ago
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Q: What is the towing capacity of 2005 GMC Sierra 1500 Z71 crew cab with V8?
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