What gear ratio should I install in my Jeep Wrangler TJ / LJ? (and other re-gearing FAQs)

[Steel City 06]

I've seen posts where dana spicer gear sets have been recommended but I am having a heck of a time googling sets for 2006 rubicons. Do these exist?
Trying to find a high end alternative to the unobtanium revolution 5.13 sets.

Be sure to confirm before ordering, but I think any “thick” gears for the standard Dana 44 factory lockers should fit. Note anything marked as being for a JK will not normally fit the TJ.

There actually is a kit that allows you to squeeze in the larger JK ring and pinion for more strength:
https://www.jantz4x4.com/jantz.php?p=detail&pro=jana_k4