Oddball u-joint needed!

I had the opposite problem, large drive shaft, small yoke. They make what is called a combination U-joint. According to what I've read on Big Block Dart, Chrysler only used two sizes on thier U-joints, 2 1/8 and 2 5/8. The measurements are taken from the inside of the brackets. You also have to know if you need inside or outside clips. Mine were both inside clip. Oh, by the way, I learned this after I went out and bought a new center section with the larger yoke to fit my U-joint!