Neapco N3-83-025X 1350 series double cardan cv flange yoke. 
Stud Socket: Accepts 0.5" diameter pin 
U-Joint Series: 1350
Pilot Diameter: 2.688" Female
Bolt Circle: 4.25"
Bolt Hole Threaded: YES M12x1.75
Center Line of U-Joint to Face of Flange: 1.625"
 
Used on many Ford transfercases, especially for rear driveshafts for Excursion and F250 and F350.