Any luck finding the front bearing retainer?
I took a look at my Ford 4 speed toploader. The retainer has some differences from the 4 speed Buick trans. It's about a half inch shorter, has a larger OD where the release bearing rides, and it has a 1-1/16" input shaft instead of a 1-1/8" shaft. Bolt spacing is close, if not the same.
There may be more differences that would require disassembly to determine.
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Thanks for looking.
I'm going to try the Ford retainer for the small input shaft.
-Joe