transmission
 

I plan on doing a 4.3L swap in my 81 toyota pickup. I have done the research and have found all the parts. I want to use my stock transmission and know that the ones with removeble bellhousing were made in certian years and an 81 was not one of those. However I believe my trans is not the original one. It is a 5 speed. Is the model number stamped on it somewhere.