If you have a 4X4 the ratios need to be the same, front & rear
If you think the housing is bent, i would buy a wrecking yard complete rear end out of a front end damaged vehicle, preferably a 2009 or 2010 Ram
In 2011 they went to a weight saving rear end, it will fit but it is not quite as strong.
You can buy just about any rear end housing complete & have a shop go through it & install your Ring & Pinion into it & SHIM it properly
You could also buy a ring & pinion of your Ratio choice from Randys Ring & Pinion, they have a good Technical Help section & i believe also a LIVE person that you can call
they have a warehouse in Franklin, Tenn. so delivery would be quick
there are other suppliers too
I still think a dismantling yard is the cheapest