The engine I got the drain plug sealed, but still have some leaking further back when running - possibly the back of the valve covers but probably the rear main seal (yea - practically new engine) grrr.
The transmission fluid I can't figure where its mostly coming from. A little at the speedo cable - which is annoying as it has new seals.
I think most is coming from where it attaches to the transfer case. I'm in no position to deal with that. And some is coming from the transfer case - but that's aft of the mount and so little.