Sounds like you're winning thus far. Hope all of the parts show up as scheduled. Also sounds like you found an issue to match with all of the complaints.
Regarding the SSR upgrade document you linked, I'm amazed how the TH400 parts from 50+ years ago are referenced and being used in something that is 30-40 years newer as 'an upgrade' haha.
Off topic (a little), you mentioned you blew through two cans of brake clean - can you get the good stuff yet? The brake clean that is considered 'legal' in NY has turned into the equivalent of using water / dish soap mix minus the bubbles. I have 9 cans of 'the good stuff' left with no means to get anymore of it, so I use it sparingly .......... wtf & smh.
Absolutely, funny how the t400 output shaft size got carried through to the T56 SSR and then ended up in the aftermarket as an update. Reportedly it's more of a 700+ hp upgrade but still woulda been nice to do since I had to source a new main shaft.
We can still get the good 'old' stuff in ND, MN, IA and WI. Some supply issues sure, but none of the 'low VOC' kind. I used to use CRC red can but they have been out of stock at the fleet supply store and it's more expensive at the auto parts store so I've been getting the berryman stuff. Cheaper and same stuff.
I did make the mistake of buying low VOC paint prep/cleaner a few years ago because it was the only kind the store had on the shelf in a smaller container, I didn't want a gallon only a quart, didn't realize what 'low VOC compliant' meant and hated it. Like you mention it was just soapy water.