Neapco N3-83-3281X 1350 series double cardan cv flange yoke. 
Stud Socket: Accepts 0.5" diameter pin 
U-Joint Series: 1350
Pilot Diameter: 3.125" Female
Bolt Circle: 4.25"
Bolt Hole Threaded: NO
Center Line of U-Joint to Face of Flange: 1.625"
 
Used on many Dodge Ram 2500/3500/5500 front driveshafts. Common pattern on aftermarket 1350 series driveshafts for Jeep JK front and rear, JL rear, JT rear.