Getting ready to do CV joint maintenance - no boot or noise problems,
just routine.
Thinking I would replace rear wheel bearings while I was mucking around
in there.  But ...
No apparent issues with bearings, no noise, wiggle at 12 & 6, 9 & 3, NO
play.  I'd be doing this based on age/miles (87 hardhat, about 145K).
So the question: Preempt now, or is there an argument to push some fresh
grease in to them and leave these *original bearings* alone until they
act up?

Opinions requested...