Clunk/knock on shutdown-6.2...

[uglytruk]

A new noise developed recently in my '87 'Burb. 170k, but well maintained, exc. oil press. When I crank 'er and let go of the key before it starts, or when I turn it off, it clunks/knocks just as the engine stops turning. This is hot or cold, no matter. I thought it was the flywheel to TC, but tight/rings. Rotated and checked FW to crank. Not engine mount, def internal.
It makes this noise consistently. I now believe it's coming from the front/timing area? Any ideas?
I wonder if I could post/link a short video w/sound?

 

[DieselDan]

What type of tranny do you have?

 

[uglytruk]

What type of tranny do you have?

TH400, hope to convert to 700R4 w/full time 4wd. I wish I knew how to download short a/v clips. I have some beauts!!! While playing clips (of knock)to friends, it seems like engine mount(?)
I just met a "geek", video's soon!

 

[DieselDan]

I don't know. I had the converter go on my 700R4 a few years ago. It made some terrible noise (but still functioned). The noise would disappear when the converter clutch would lock up. Not that this info really helps (400 converts don't lock up).