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4th Gen Ram Tech2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Tough to say, but it's gonne be in the transfer case or transmission. You could try taking out the R.R. Axle shaft and see if that helps, but really I'd be driving or having it towed to the dealer.