So I'm in the final stages of assembly with the driveline on my 49 3/4 ton. I've been looking at the output shaft u joints on the transmission and wondering how they get lubricated. Do they just catch some gear oil splash from off the speedo gears? Should i be pulling apart the assembly to grease them while i have the torque tube off? I never pulled them apart when i rebuilt the transmission because they felt very smooth, and also because i had a hard time finding a replacement online.

Had a hard time finding much for info on this joint in both the manual and online. Thoughts?
Thanks