No I replaced the speedo gear/bushing to feeds down into transmission. I’m assuming interior gear is a joy to get to...
It's not horrible... I found an excellent 02J rebuild manual that I used to make 1 good trans out of 2 broken ones. Of course the trans has to come out first. From there I think it took me a little over an hour to have the trans torn down. Reassembly wasn't bad either - I just got a little hung up on the 5th gear install since it kinda pops all apart and I didn't notice the original orientation. I should have looked in the Bentley manual earlier!!!
If you go in - I'd also replace the diff rivets with the ARP hardware (assuming your trans was a mid-04 or earlier (there is no replacement for the 04.5 up 02J diff rivets). That's what took out my original trans.
Looks like you need to pull off the diff bearing to replace the drive gear. The LSD I installed (after drilling out the rivets on the 05 replacement trans and having no way to replace them) came with the drive gear already installed.