its generally a very good idea, too,I pulled the front hub off of my 64 C30, the bearings are in excellent shape. But, they are covered by a very dark, almost translucent brown maple syrup grease. The bearings were repacked in 1980 and then the truck was parked in 1986. Is that grease still good?
keep a bound note pad with notes in your glove compartment,
on the wiring, wire colors, wire gauges, relays used ,
ground locations, fuse amps, fuel and oil and air filter part numbers, type of oil used,
dates on oil/filter changes, brake fluid replacement dates, when the brake pads/calipers etc were last changed etc.
keep a log on, when alignments were done, what size and brand of tires you use,
and visually inspect the tires, brake fluid and oil levels every few days
and any time you remove a wheel, inspect the brake rotors, pads and ball joints and if the car/trucks up on a lift,
it certainly helps to visually inspect the u-joints, ball joints and do a suspension lube
NEW and most likely far better quality bearing Grease is cheap,
easy to replace and older grease, has a limited life expectancy,
there's been several leaps in bearing and lube technology in the last 35 years.
one of the most common mistakes many guys who try to resurrect older muscle cars make ,
is to not replace lubricants and coolant and brake fluid and wear components like spark plugs and brake shoes, light bulbs, etc.
Id strongly suggest, you clean away the old grease and re-pack the bearings carefully with a new high quality bearing grease.
,try hard not to mix types of grease as occasionally that can cause issues
it certainly helps to do some research on both grease and the car you work on before diving into any project!
and you really should own a shop manual
for any car/truck you own, as reference material
read through the links in this thread
and sub links,
your cheating only yourself
https://carcaretotal.com/best-wheel-bearing-greases/
https://saferoad.org/best-wheel-bearing-grease/
https://autoquarterly.com/best-wheel-bearing-greases/
https://thewashingtonnote.com/best-wheel-bearing-grease/
https://www.carbibles.com/best-wheel-bearing-grease/
https://www.howacarworks.com/wheels-and-tyres/lubricating-and-reassembling-wheel-bearings
http://garage.grumpysperformance.com/index.php?threads/greasing-ball-joints-etc.3150/#post-95801
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