Not Ranked
You should replace those u joints with the spicer spl joints and never grease them again---they don't have a zerk fitting and use a different type seal. My truck has over 500,000 miles and I replaced them at around 220,000 when I had the driveshafts out for replacing the center hanger ---
The SPL are the only type I use any more if available for the application and if not, I consider redoing the shafts so I can use them.
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