The man wants MORE caster. How about this idea?

Kern Dog said

I wish that I knew an alignment guy that liked to tinker in his free time.
I estimated adding 1/4" just as a starting point. Something like this could be mocked up on a test chassis and measured and recorded. The tubular arms that are purported to add up to 3 degrees or more could be measured, "mapped" so to speak and then the stock arms could be measured to compare.
I have a buddy's car in the shop out back, a '68 Satellite with Firm Feel UCAs. I could measure them and compare them to my stock arms on the shelf.
For example, take the stock arm below...

View attachment 1716206040

I could measure between the zerk and the forward bushing and the same between the zerk and rearmost bushing and then compare the numbers to the Firm Feel arms. Just some bonehead logic at work here but I'd suspect that the aftermarket arms would have a longer front measurement than stock and a shorter rear number, effectively moving the top of the spindle/knuckle rearward.

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If it were me, I'd just use a hole saw a bit larger in diameter than the upper ball joint threads. Mount the UCA in a vice or fixture so the ball joint is at 0°, drill out the circle containing the ball joint mount, and then tilt the mount until you have the desired caster improvement. Weld the ball joint mount back in.

***edit*** You'd have to relocate the ball joint rearward. Changing the angle wouldn't do anything. ***

That way, there's no change in the length of the control arm, so the track width isn't changed any. I know that would be a small amount since you're only extending one leg of the UCA, but it would still change it some.





After welding the mount back in you could weld in an additional "ring" around the shoulder of the ball joint if you were concerned about the strength.

Kern Dog said

By the way, what so many people call a spindle is actually a steering knuckle. The spindle is technically the horizontal section that the hub and brake attach to. Most people call the whole thing a spindle, just like how "emergency brake" gets used to describe what is actually a Parking Brake, a Sure Grip gets called a Posi, etc.

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Technically yes. But even the factory used the terms interchangeably

Parts manual


Kit Car catalog




Now I'm not going to scour every factory publication and do a count, not the point. My point is just that its not just the general public that uses the terms interchangeably.

Sure Grip and Positraction are just the copyrighted trade names for a limited slip differential, they're just the same thing by a different manufacturer.