This is just a vent correct?
Yeah, that's your diff vent. If you need a new one, which it looks like you do I found one on eBay over the summer and installed because mine didn't have anything when I bought it.
https://ebay.us/m/giC9mJ
It says it doesn't fit TJs but I was able to tap it in with no issues.
It is a vent, and it is necessary. It should be a simple fix.
Any tips on removing it?
A jack under the pinon or spring perch, depending on which way the axle needs to rotate. In this case a bottle jack under the front of the spring perch should line it up.
Did you use anything to secure it or is it just pressed in?
It just pressed in with some small light taps from the hammer.
