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Hello All and Happy New Year,
Kev posted a repair article I wrote documenting my journey to resolve an annoying driveline vibration while overdrive is engaged. Since the article is a supplement to 1940 Service Letter, Vol 14, Number 11, it is now listed there along with the rest of the Volume 14 letters; you can find it here: (https://www.packardinfo.com/xoops/html/downloads/SC/SL-VOL14NO11_ADDENDUM.pdf)

It hope it helps for anyone who has a 1940 transmission with R9 overdrive installed and has experienced an annoying vibration. If you notice any errors or content missing, please let me know.

(by the way, my approach to increasing the overdrive engagement speed is in the forum here: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=5476&viewmode=flat&order=ASC&type=&mode=0&start=0#threadtop )