I actually have a carrier transmission on the bench right now for re-assembly, which is why I know about those two. I will pul one now and see what thread it is. However, in civil servant fashion, I merely looked in my FUC-03 manual in front of me and they are indeed listed as using two of C01UC100400 tecalimite #28 3/8 BSF fittings. Don't forget that the regular Ford transmission housing has it's own part number for this application, so in the drawings they may have specified to tap the holes to BSF. I know I have adapted regular truck transmission housings to carrier application before by adding a hole or two on the back which is not on the normal applications.
A check in the back of the manual shows this fitting in use in over 21 different sections of the manual.
There is another on the fan extension.
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