Transfer box actuator seal issue.

Hi, lads.

I have a leak in me underbelly, and my mechanic said it's a transfer box actuator seal. He said that usually you can't just replace the seals, you need to replace the actuator. This is obviously expensive stuff unless I can get my hands on a used one, so I wanted to run this by people who know more than I do about this particular vehicle before I go ahead and order things, and just see if anyone has any advice. It's a 3rd gen non-facelift Jim from 08.

Thanks in advance.