How much does it cost to replace the steering knuckle? on 2002 Toyota Camry

Steering effort is very high. Lubricating the knuckle with WD40 alleviates the problem, but only temporarily.

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There are several models in the Camry line and engine sizes, if it is a Camry sedan with a 4cyl. engine, to replace the steering rack and pinion, the labor time is about 5 hours and then you will need a front end alignment. You can get a price for the steering rack from Autozone.
I have a 02 Camry but it is a V6 there is a disagreement whether I can replace the steering knuckle without replacing the whole column or not. Can you please advise your opinion?