Tubular upper control arms Issue

skep419 said

I know its the wrong bump stop. The factory one missed completely. This picture is taken at ride height. The control arm hits while turning at ride height.
So my question was how is it possible that the wrong bump stop caused the issue.
I'm thinking the brake caliper being on the back was the issue the whole time because the control arm looks to have plenty of room on the front of the rotor.
But I've been wrong before.

Click to expand...

The bump stop caused the issue because it’s too short. A stock lower bump stop is a good 1/4” or so shorter than a stock upper. On top of that, it’s a lower bump stop, and as I explained earlier the lower bump stops were designed to have a progressive rate, so they flex more because the stock torsion bars and ride height used them as part of the suspension. So they allow even more movement. Which was good for anstock lower bumpstop and not good for an upper.

All kind of people run the calipers to the rear without any issues, and they have to be there on the 67-72 cars with sway bars and 73+ brakes.

And really, that’s an aftermarket tubular UCA, and in most cases they require modifications to the bump stops anyway. So it was up to the installer to make sure everything cleared, because the tubular UCA has different dimensions than a stock arm so you need to change the bump stop to something that will keep the new UCA from hitting things.