TH400 Questions

[ThreeQuarter]

1. If I pull the slip yoke out of my TH400's 2wd tail housing, should I lose a little fluid?
- I'm parked on a level slab and my pickup is at factory height & stance.
- I pulled my slip yoke and only got a few drips from the yoke, nothing flowed over the rear seal.
- Dipstick has been consistently reading full when hot. I think I am using the right dipstick and tube combo, but how can I know for sure?
- The transmission seems to have been driving fine.

2. My slip yoke was new & shiny when I installed it, and after 2000 miles in my transmission it now has rust around the end. I think that's not normal--what could be happening here?