This is how I strengthen the lower king pin on my steering knuckle for my 80 series race car. This involves using a brace kit from Rampt Customs (in you are interested link below) and then welding it in place using a cast steel welding technique. This process also involves preheating and post heating the components to be welded. (EDIT: In the video, I say cast iron but it is actually cast steel.)
You can get the kit here.
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