HELP! I'm running out of ideas

steering box is tight and torqued down to recommended spec, including the coupler. Once my new rims and tires come in I'll throw them on to see if that changes things.

I'm planning on switching out my leaf springs (for the hotchkis springs I bought a few years ago that made the tires rub, due to wrong offset rim) out back when the new rims with proper offset come. I'm also switching the stock shocks for the adjustable QA1 shocks so I'll make sure to check everything there when I do so.

It is just so strange that it drives fine without noise and then when you turn in at speed I get this really violent shake (literally like the wheel is about to come off). I think I'll just replace the inner and outer bearings and races on both discs for peace of mind.