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2009 GMC Sierra Denali Reverse Bulb Number

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Old 06-16-2013, 07:49 PM   #1
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Default 2009 GMC Sierra Denali Reverse Bulb Number

Hi there does anybody know what the replacement bulb number is for a 09 Sierra Denali reverse light says 921 online but recon and manual say 4057.
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Old 06-16-2013, 08:41 PM   #2
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Only 2 screws to take the tail lamp off just pull it off and check the bulb. Easiest way to know for sure.
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Old 06-17-2013, 09:36 AM   #3
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Sylvania bulb guide says reverse is 921 and the signal/brake are 4157NA

Edit to add
Its still a good idea to check, I work in the shop for a living and I'd say at least 2/5 listings are wrong for everything ooooorrrr the parts guy at the last 3 shops is special with a capital "R"
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Old 06-17-2013, 10:24 AM   #4
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07-08 most were 3047 (AKA 4157)
09-10 most were 921 (AKA the large peanut bulb)
11+ they switched back to the 3047

Should be able to i.d. yours without pulling the taillamp. The two bulbs are very different in size.
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