Dude, I hate to tell you this, but that's a metric 40.
They were in very limited numbers, because they were the first of it's kind released in '87 and the project was cut after they had already released several hundred.
It's the housing of a 44 and the internals of a 35 with 30 spider and side gears.
That's why it has "44" on the case.
Why do you think you got it so cheap.
Those are in all of the yards here.