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Discussion Starter · #1 ·
Ok so I travel on the road for my job with my buddy so I don't have my truck with me at the moment. I'm tryin to buy a zone lift for my 2012 2500 st and its askin if ithe axle diameter is 3.5" or 4". Can someone help me out with this, I'd appreciate it!
 

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You should have the 11.5" rear so you'll have 4" axles
 
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So is it as easy as putting a tape measure around the axel to measure? I have a 2012 3500 mega cab Laramie. Need measurement for bds lift
 

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Diameter is the width of the circle(if that makes sense) its the cross sectional area of the thickest part of the axle. If you measure around the axle, you will have to divide it by Pi (3.14).
 

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Pretty sure all are 4" axle tubes since '03 or '04 and all manuals. Not 100% on that so don't quote me. Think only the 11.5" rear end is in there anymore so you won't find anymore 3.5" axles on newer models...
 

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