Transmission rear seal leaking 2000 AC 2WD 4.7

Crawled under my truck and noticed small ATF leak where driveshaft yoke slides into rear of transmission along with fluid being slung onto underside of body there. Looks like simple job to replace. Any gotchas, pitfalls or other warnings I should be aware of before I start? Thanks.

 

Not sure, but I would start by reading the FSM covering that system. Some good tips in there.

 

I thought this was a seal as well. Turns out the yoke (at least on my 2004) is defective so I had to buy a new yoke and install. Stopped all leaking. Some people were able to fix it by patching the yoke with JB weld/actual welding... I was not able to.

 

I read somewhere there was a TSB for 2004 defective yolks where they leak around a plug that is pressed into the end. I’ve had some buds fix theirs either with JB weld or melting some plastic in the end to seal it

 

So definitely plug this hole it's not a breather hole correct?