I wanted to keep the original setup, but when I changed rear ends it was no longer original anyways. The driveline shop couldn't make a new driveline with a trunion because the required parts weren't available
Spicer hasnt had them available for many years. The original driveline was slightly bent from 45+ years use. My trunion was without a boot for 15 years prior to the change and not rebuildable.