I’ve had my 83 pickup since 1987 so I assume the W52 transmission is the original and untouched until I rebuilt in 2021.
I’ve read on this forum that this transmission was mainly used in Australia.
Wikipedia agrees with this and further says it was used in pickups 1984-1988.
I don’t know if it’s of any help, but the W52 steel case carries what looks like a Toyota part number: 33111-20091 and the aluminum extension housing: 33141-20090 and SK 13A, no numbers on the bell housing.
I found no additional tags.
Per the factory manual, the L52 and L45 are for 4x4 trucks.