NP 435 trans help

I have a NP 435 trans in my slant six 83 stepside and the rear yoke seems as though it has alot of play in it. It is not a slip in yoke style but a fixed yoke attached by a bolt to the back of the trans then there is a slip yoke on the drive shaft. Does anyone know anything about these trans that could give me some help on either getting another yoke to put on it or how I can fix the play.


Thanks

Jeff