I had to do a rear U-joint on an artillery tractor (Chev) a couple days ago and found the U joint that was commonly referred to on MLU was too short. The U joint referred to equals a UJ331 (the 331 is a common reference and the spicer number is 5-1350x). Caps are 1.188 diameter and the height is 3.622
A little research led to the right U-joint. The caps are 1.188 diameter and the height from top to bottom on the caps is 4.187. They are spicer 1410 series U joints and use part number 5-1410X. Another common trade number is UJ330.
It may be that the number listed on MLU is for the smaller or earlier trucks. But the various cab13 shafts I have sitting here all appear to use the latter UJ330 (spicer 5-1410X) U-joint.
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