Help Me Understand How Adjustable Rear Upper Control Arms Work

[GripSpec]

Adjustable RUCA's seem like a fairly simple concept. You shorten the length of the arm, which increases negative camber. The problem that I have with this concept is that, even with the rear control arm completely removed, The rear hubs are completely ridged and stationary due to the toe rods/traction rods. There is no play in the assembly to tilt the top of the hub in order for it to accommodate a shorter upper control arm.

The only way that you can get the hub to meet with the hole on the RUCA is to push up on the hub, since negative camber naturally increases as the hub is lifted upwards. This does not really help things however, because the oem RUCA would be at the same camber angle at that height as well. It doesn't change anything.

I'm obviously missing something. Take me to school.

[PoorMans180SX]

That's why you get adjustable toe arms too.

Someone might be nice enough to explain all the dynamics of it, but probably not.

It's not really that hard to find out. Do some research.

[cdlong]

there's also some play in the bushings of the rear suspension.

[GripSpec]

there's also some play in the bushings of the rear suspension.

Yea, I have a very good understanding of how toe/camber relate to each other and how the rear suspension is designed. I was just very confused when I saw how stiff the rear hubs stayed, even with the upper control arms and shocks completely removed. After talking to a couple people it seems that the rear hubs will move if you use a bit of elbow grease.