Is there a problem installing a new bearing into an old race if the race appears to be in good condition?

__________________
1984 300SD turbo 126
"My true love"

God made me an atheist and who am I to question His wisdom

Yes.

Obviously, it can be done. But it's not the better option.

X2
Always replace both when ever you can.

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving