Bolt-on yoke TH400 to 4L80E

[storm9c1]

When I removed the bolt-on yoke from my TH400, it was pretty wet outside with trans fluid and was clearly seeping and slinging trans fluid all over the place. The bolt wasn't very tight at all. This yoke had an open end with a very thick washer. This washer was about 1/4" thick -- one side was smooth, flip it over, and the other had a slightly raised ridge machined into it.

I installed this yoke on my 4L80E, it was a tight fit over the output shaft and needed a tool rigged up out of a piece of all-thread and nut to get it to press on. Once it was fully seated, I made sure the machined side with the edge of the washer was facing inward, and tightened the bolt quite tight (I believe I looked up the torque for the TH400 in my FSM -- but that was months ago when I did it). Was there anything else I should have done to prevent seepage from this bolt area? I don't want it to start leaking on me later.

Before anyone asks, it's a multi-piece drive shaft with the slip yoke at the last segment, thus the bolt-on yoke at the trans.