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· Supr Moderator AutoTech SS-Guru Mbr Extraordinaire
2015 High Country Duramax
19,431 Posts
Not true. I've seen trucks with the towing package and an open diff and 3.08 gears.

It's super easy to check with the rpo codes so there's no need to guess at what you have.

Here's the gear ratios incase you want to know that as well

GU4= 3.08
GU5= 3.23
GU6= 3.42
GT4= 3.73
GT5= 4.10

You won't have 3.73 or 4.10 since they don't make 1500's with those ratios anymore.

· Member Extraordinaire, Servicemen, How-To Author
16,428 Posts
Why would GM cease putting a 3.73 or 4.10 in a 1500? Oh, let me guess, it is all about the EPA fuel efficiency standards.

· Member Extraordinaire, How-To Author, TOTM
22,225 Posts
Go to build your own Silverado on their website and you will be surprised what options will delete or add what features. Will give you a better idea. Remember not every trim model will automatically come with certain features.

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