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If the seals are good the grease cannot do any thing other than lube the joint. Still cannot see the temp of the uj going past the operating range of quality/proper lube. We all know I am not in favor of uj axles but on the other hand I cannot see the operating temp being a factor in failure. It is much more likely the large and constant angular change is to blame or just using whatever grease is in the grease gun......
interesting video and always grease till it comes out of all 4 caps that i thought was just common knowledge lol when i ran them i would grease them before every trip and wipe off the excess of course and on a week trip i would grease them again say wens evening or afternoon depending. but these practices were probably over kill however i would get many seasons w/o issue with the good u joints like rockford or spicer. i do have to say out of all the brands i tried neapco is the bottom of the barrel and that one really surprised back then since they were still made in the usa where the precisions weren't at that time.
The " lot of heat " thing is all speculation since it was not measured and even too hot to touch would likely be well within operating temps....................wellllllll,you can see my skepticism. IF the temp of the uj's was taken and is/was above 300F then I'll back off my assertion.
the hotter they get the faster the grease wants to run out and i have had enough experience with neapco to know they are not up to the task on motor cycle powered sand rail or 3.8 v6 powered either lol they a poor design compared to spicer or rockford imo based on my application. i modified a very large c clamp years ago so not to use a hammer and the vise when ever possible.