Cheers,
I am currently rebuilding and converting a 1984/5 hilux 4X2 for my son.it came with a 3y and auto I think that the 3y was around for a couple of years 83/86 then replaced by 4y then the next gen cross flow 2.4 litre motors. Cant remember a 2y the early models had an 18rc.
Hope this helps
Dave