4-Speed Rebuilder Recommendation

I had a reputable shop near Portland , OR that specializes in Muncie’s rebuild it originally. My builder had to send it back to him after it started leaking oil before we even ran it. He “fixed” it and we reinstalled (several years ago). Finally got around to getting the car on the road and she won’t stay in 2nd gear. We ruled out the linkage. Conventional wisdom says it’s the 2nd gear synchros. I’m hesitant to rebuild myself for fear of missing something like this. I’d rather have someone with direct experience with the A833 do it.

They aren't too terribly difficult to rebuild, but they can be tricky to get together without some trial and error. I have been building them for many years, and currently have 5 A body 4 speed's in shop that I need to get done for customers. I'm sure there are books and You Tube videos on doing these, but I have made some of my own tools to make things easier. I can't tell you how many of these thing's I get in boxes torn apart that people gave up on. I am not by any means trying to talk anyone out of trying it, but to take them down the way I do and get into them, you best have a diagram/blowup of parts .