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Discussion Starter · #1 ·
Just bought my 2011 Silverado ext cab 4x4. with a 5.3 and HD towing package
In my owners manual it say I have either an Allison transmission or a hydromatic but I can't find any easy way to tell which. Are there any labels on the truck that shows what I have?
 

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Look in the glove box for a decal with a list of 3 digit codes. You should see either M30 for the 4L60e 4 speed or MYC for the 6 speed.
Allison transmissions are used with the Duramax.

http://www.gm-trucks.com/rpo-code-lookup/
 

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Discussion Starter · #4 ·
I know its a 6 speed. I also have Tow/haul mode
in the owners manual it describes a feature then says Allison or Hydromatic as far as I can tell I can't find any features that are only on one or the other.
 

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^I guess when I said it, it wasn't believable. LoL
 

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^ I'm glad someone did. LoL
 
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