04 Tac leaking gear oil

hey guys before I bring it to the shop I wanted to get some opinions on what needs to be done. My 04 Tacoma 6 cylinder 4x4 is leaking gear oil from where the drive shaft (not sure that's the right term) meets the pumpkin. Wondering if this is going to be a big fix or if there's a seal there that went bad? It's a sonewhat slow leak and I'm keeping the pumpkin filled. Trucks got 150,000 on it. Thank you!

 

That's called the pinion seal and it may be cheaper to keep topping it up. But always worth it to see if someone will do it for a reasonable price.