4wd and engine bay smoke

[Wheelbarrow]

I have a 1991 loyale wagon 4wd ea82. I have been browsing this forum for a while and it has helped me troubleshoot and fix many issues on my wagon. Just when I think I have the ol girl in tip top shape this happens.

 

After I use the push button 4wd and park/ get out of the car there is noticeable smoke coming out of the engine bay. It looks like there is some fluid dripping onto the exhaust. It does not smoke in fwd. why would it only smoke after 4wd?

 

This is the first time I have not been able to find an answer in previous posts. Thank you in advance for your help.