how important is it to clock your grease zerks
 

I've always been told and always followed the rule that states whe installing u joints in a drive shaft to clock the grease zerks 180* off eachother. Is it a myth of an integral part of driveline harmonics?
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Re: how important is it to clock your grease zerks
 

No...most heavy trucks have them lined up so you can do them all at once.

You may be thinking of u joint phasing on multi piece driveshafts