YDTJ-CB Manufacturing Defect.
Gents, when you put them on the floor, and you pull all the plugs out to blow out the oil passages, do yourselves a favor and check to the the oil passages are actually drilled out entirely.
Just overhauled a CB, only to find out after a quick failure that the oil passage feeding the front pinion bearing stopped short of reaching the supply galley by .178", verified by my good friends at York.
Just a heads up to hopefully save you good people the headaches.
Go the extra mile, it's shorter than you think. UA in the Bay