Some have said replacing a tranny is simple ,but yours has the 4wd drive trans fer case which is about as heavy as the tranny. I have replaced a std 4 speed in a 70 Dodge 3/4 T and a big auto in an old 61 ford station wagon, and I use to rebuild those Fordamatics and Chevy Power glides.
I would not even tackle the Toyota 4WD 5 speed now at my age and bad shoulders like you.
