I am not sure if the bearing manufacturer mattered. But, I did order new one made by FK, which is a US. Same price as generic.
I think the service life is affected by rain, dirt and g-loading from track use with sticky tires. Eventually things wear out.
I found that my car, with refreshed suspension, mono balls and poly bronze bushings was very precise and immediate. Steering is crisp and you know what it is going to do.
This is the second time I experienced the feeling of unintended rear steer.
It was a sudden input, heighten by the underlying precision of the rest of the chassis. Not “dive across the road” looseness. More of a sudden added rotation that required an immediate steering correction.
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