You can see just how underbuilt the stock knuckle is in the area of the balljoint. We are not sure what Toyota was thinking as this is the size of something you would see in a car, not a heavy-duty pickup truck. We know a few people who have broken the knuckle driving offroad. The cut-out for the balljoint is a total stress riser for a crack to propagate.
The other area of the knuckle that is weak is the tie rod mounting point. The Camburg part is triangulated and immeasurably stronger here! It’s obvious to see. For more details on the knuckle, you can read this.
Here is the Coachbuilder tie rod compared to the stock Toyota part. You can see that it is much beefier! The OEM tie rod has a kink that weakens it. The tie rod is known to bend on the Tundra in offroad driving and it is what bent on our truck which started this whole adventure in suspension fortification.
The Coachbuilder tie rod moves the end pivot closer to the knuckle. This geometry change reduces bump steer which is important in a longer travel suspension. We wrote extensively about the tie rods in an older article.
The Dirt King Fabrication lower control arm is much stronger, basically has better ball joint or spherical bearing angularity, delrin bushings, mounts for limit straps, and bypass shocks. We wrote about it in detail in an earlier article.