On u-joints I pump until good clean grease comes out of the joint, however many pumps it takes (for grease either follow FSM or use what you got; anything is better than nothing). The slip yoke is far more critical to the driveshaft as its not as easily replaceable (Yota driveshafts typically put all the zerks in a line when assembled similar to factory, otherwise use prevailing driveshaft phasing logic...). I typically use a grease with high moly content (10% or more) on the slip yokes, pull the slip yoke off and clean the male and female sides, then butter it up with new grease, remove the zerk and push the yoke all the way down, re-install the zerk and be on your way...
I never use the slip zerk to grease it as it just puts the grease above the splines, every driveshaft I have ever taken apart always has unused grease sitting at the top of the cavity which doesn't help the splines at all...
I never use the slip zerk to grease it as it just puts the grease above the splines, every driveshaft I have ever taken apart always has unused grease sitting at the top of the cavity which doesn't help the splines at all...
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