[viiagrag]

The steering gear turns steering wheel input into output that turns the wheels. Its a Recirculating ball setup, which is not quite the same thing as a rack and pinion setup even though it accomplishes the same thing. The 670 series box is lightyears ahead in terms of its valving technology. Decrease power assist lag, better feedback, and increased precision all result in much higher driver confidence. Aka, knowing where the wheels are on the road, and much better feel for the actual grip the tires have as more feedback is transmitted to the driver.

See diagram below. The two shorter links center the axle longitudinally (front to back) and are called lower control arms, trailing arms, or LCAs. The longer one centers the axle laterally in the car (side to side motion) and is called a panhard bar. These pieces are made of Chromoly steel, so they are stronger and lighter thatn non chromoly(though ever so slightly heavier than the stock pieces they are replacing). But the biggest advantage is how they attach to the car.

Instead of rubber bushings which while making for a nice cushy ride, they deflect a great deal and this causes slop in the suspension. These Rotojoints are a very small step down from a full on spherical rod-end joint (heim joint) and practically eliminate any delfection. The delrin design is rebuildable and much longer lasting.

The below pic shows how a panhard bar and a watts link differ.




I wanted to purchase a Watts Link which removes the jacking effect by changing the pivot point. However the price tag is $700 for the watts link, and $120 for the rotojointed panhard bar (the long one). I can resell the panhard bar later when I'm ready to install a watts link at nearly the price I paid.