RAD, most likely RAD-Y. That's what my stored trans tag says. Same casting numbers on case.
Was from a 2.3 turbo Capri. Think it's 1980 year. Was written on trans with a yellow paint pen.
Car's first trans is long gone. Replaced in 1987. Same tag code, match verified by trans shop.
Of course, if no tag, cannot positively confirm a 'Y' .
Door data plate trans code is 6. Marti report also says trans 6. 6= Four speed Borg Warner.
Pretty certain Ford carried RAD-Y over again in '80 in cars with the 2.3T engine.
Turbo cars had certain non-engine parts changed/upgraded from n/a 2.3 to V6-V8 spec due to added performance.
Transmission, brakes, cooling, exhaust system.
http://www.mustangii.org/tech/trans/
A while back, copied trans #2 tag data, in ink, to the tag example pic in the shop manual:
1979 data:
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