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How Do I Know if I Have an HD-Model 2007 Chevy Silverado Z71?

Question:

Where can I find out if my truck is HD. I look on the door couldn’t find it

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Expert Reply:

One of the easiest tell-tale signs whether you have an HD model 2007 Chevy Silverado Z21 is if the wheels have an 8-lug nut pattern. If it does have that pattern, then your vehicle is an HD model. If it does not have an 8-lug nut pattern, then it is not an HD model Z21.

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Question:

I was wondering because what gear oil do I use in it. Because the HD model take 75-90w and my model take 80-90w

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Expert Reply:

Yes, you are correct that the HD model 2007 Chevy Silverado Z21 takes 75w90 differential oil and the 1500 non-hd model takes 80w90.

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