2006 Nissan frontier, noise from rear end, no vibration, just a slight thumping noise, brand new tires, still does it.

Go with rear axle inner bearing (Part Code 43210)

Axle tube --not diff---just change the fluid on it

Go to Nissan Parts Zone.Com & print the axle housing
diagram. $67.00 bearing, just bolts on, you can do yourself

That is the C200 housing ,you may have the Dana if you got
the pro x or le

I would do both sides

Go to the internet forums, you'll find the problem

Just bought a 2014 Frontier 3 weeks ago

I once owned a trans shop & found I had to do all my own
road tests & such for those issues,not many people are
good at chassis diagnoses