[GT289]

Haven't used. Very familiar with the providing vendor. Interesting write-up in the NPD ad..... "camber curve has been optimized
by building Shelby Drop geometry into the billet aluminum cross shaft."
Mere relocation of the upper arm doesn't do a thing to "optimize" the camber curve. Dropping the UCA merely slows the arrival of
whatever camber curve is prescribed by the lengths of both of the arms.
Not crazy about the built-in drop cross-shaft. Would have to look at the material being used and figure strength of materials.
(SorT has that too but I know Shaun has done the math on his products)
There's no crossbar on the upper arm in the photo.

ex-Global West GM
1991-1995

 

[GT289]

I know you worked with this in the past but I don't see how dropping the arm wouldn't help the camber curve. I once calculated it for different scenarios. The base geometry has some camber gain, relative to the chassis, but it’s only ~30% of the body roll and the camber relative to the pavement will increase with body roll.
As I see it, both dropping the upper arm and shortening it can minimize the positive camber gain. The orange one has 1" shorter upper arms (just to see the effect).

View attachment 832198

Yes, merely dropping it doesn't quite fix. (fix = at least "zeroing" the positive camber gain)
Shorter arm in the SPC product?...... I don't know if that's the case.
In general, never really understood people's reluctance to address a really big shortcoming in the Mustang front end, that factory UCA.
Willing to lower, because it's basically a free mod, but not replace it and really vastly improve the situation. And replacing it with
many of the tubular upper arm upgrades is a major improvement from the aspect of handling, dynamics, strength and lack of noise.
It's not the kind of improvement you can debate for hours like subframe connectors, it's really obvious, like a frying pan to the forehead.

Sadly I don't think this SPC item is the solution it could be.

ex-Global West GM
1991-1995