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A 3 speed that was used on sixes, SBF, BBF and even GM stuff was the "303" all synchro three speed intro'd (iirc) in 1964 in cars, and maybe a year or so earlier in light trucks.
Type 3.03 intro'd in 1963 (could be a RAN or RAT), was initially used in 1963/64 F100/250's and 223 I-6 Galaxies & V8: Galaxies, Fairlanes & (63 1/2/64) Falcon's.
Was not used with 144/170 & (and in some cases) 200 I-6's until later in the 1960's. These engines initially used the type 2.77 1st gear crash box.
So, a 1963 and later Ranchero...depending on year/engine size, could have either 3 speed trans.