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FYI,
My truck still has a sticker on the axle housing that says 3.92

But seriously , the info above about finding your window sticker is right on.
 

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2015 RAM 1500 CC 4x4
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Window sheet says 3.21 but i know ecodiesels came only in 3.55 and 3.92or 3.91.
I have towed a load around 14k without a problem but now im wondering what the ratio actually is?
3.21 is listed under standard equipment. Go to the options side and look and it will show the rear end as an option either 3.55's or 3.92's.

Driving down the road in 8th gear at 60 if your doing 1500 rpm you have 3.55's
 

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Do like we did in the old days...jack the back of the truck up getting the rear tire off the ground, make sure you caulk the front , mark the drive shaft and rear tire. Start the truck and put it into neutral. Rotate the rear tire 2 times and count the number of times the drive shaft turns. Close to 4 times = 3.92. Close to 3 1/2 = 3.55 Close to 3 = 3.21.
 

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2016 Big Horn 4X4 Engine and Transmission tuned by no longer available (but truck runs good)
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320 Posts
I can't find it any more help ?
Welcome (y) I do not remember the Canadian site addy:cry:, start a new thread asking and you should have the info you need right away;)
 

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Window sheet says 3.21 but i know ecodiesels came only in 3.55 and 3.92or 3.91.
I have towed a load around 14k without a problem but now im wondering what the ratio actually is?
What year truck? 3.21 was not available in 2nd gen, only 3.55 standard and 3.92 optional.
 
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