By the way, if they are "acme" threads, you should be able to tell easily by looking at them. If you have any exposed to see, where a standard thread has a sharp peak, an acme thread is more squared off (flattened) in both peak and valley. Think, vise threads.
Officially it's a trapezoidal thread form, but I don't know if they're all exactly the same other than diameter of base material, or if they can vary by need.
They're typically used in high load situations.
If you can see what look like normal threads then, they probably are. If they're flat-topped, they're acme. Probably assembled in the desert by Wylie Coyote!
You thinking about replacing the upper eye with a spherical rod end (Heim) or doing something else with it?
I probably won't recommend/advocate for doing some custom mod, but I'm curious as all get out if you're doing something.
Paul