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Can someone please help me figure out how to determine which axel I have on my 2012 1500 Laramie Crew Cab? I want to buy a trailer and need to know if I have the 3.55 or the 3.92. Apparently they have quite the different towing capacities. Thank you in advance.
 

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There should be a metal tag on one of the diff cover bolts that says the ratio...unless it has been removed. There is also a link on this page to a build/option site that lets you enter the vin and gives you a build sheet.
 
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