Here's a good build of a 70 trayback, worth a read
http://pirate4x4.fr/showthread.php/9409-Toyota-KZJ-AJS
http://pirate4x4.fr/showthread.php/9409-Toyota-KZJ-AJS
I checked the VIN plate on the 70. Pretty sure I have the R150F transmission. Wouldn't the transfer case have its own model number?
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Yep that's the gearbox, the transfer box should have its own code, not a clue what it is though but this place sells them
http://www.marks4wd.com/low-range-overdrive-gears/low-range-gears/toyota.html
Pricy though :O