Hello LJtoyota, I think you might have a Japanese truck that was imported decades ago. These units were sold cheap but they were for the Japanese market and parts were very hard to get and every thing on the truck was written in Japanese. I have contacted my local Dealer and there is nothing in the Main Toyota system on this Model and Serial #. They did stamp the Model and serial # on the right hand side of the truck frame just under the hood. I would scrape off the paint and see if you can find more info. Sorry for the bad news