1350 to GM 3R Series Combination Neapco Greaseable Universal Joint.  This is a very popular and handy u-joint when connecting mismatched driveline components. 

Use this to connect 1350 series components to GM 3R series components.

• Neapco GREASEABLE U-Joint
• Grease Fitting in body of u-joint
• Requires regular maintenance intervals for long life
• 1350 series dimensions
  • Dimension B = 3.625 inches (3 5/8) wide
  • Dimension D = 2 bearing caps are 1.187 inch diameter
  • outside snap rings
• GM 3R series dimensions
  • Dimension A  = 2.562 inches (2 9/16) wide
  • Dimension C = 2 bearing caps are 1.125 inch diameter with inside "C" Clips to lock the cap in place. 
  • inside "C" Clips
  • The span between the yoke inner surfaces where the "C" Clips lock in is 2.562 inches