I was going to see if UPR responded to what they thought about the bind issue first but heres
my $.02 on the subject, based on racing expierence and years of use of many different arms on my own car, along with cars through my shop.
In a race car, all the joints are heim joints and I have full articulation and can control the rear the way I need to with supports, angles, coil overs and anti-sway bars...the key is for it all to move freely.
In a street car, you always comprise a little unless you want to deal with a little noise and maintenance. Some complain about spherical bushings on the street I never found them a pain, and as loud as most of our cars are whats a little more...hell most time you can't hear it.
I know MM preaches the bind issue and it spreads like a STD from a hot girl
on the internet but I am not 100% sold. Years ago Steeda had a 3 piece bushing set-up in there control arm, all different hardness levels of poly. They no long have those 3 piece and have went to a single poly bushing..the arm is near identical design to the UPR street upper, and near every other manufactures..you can only change the design so much, you know?
I like these in a street car...no noise added, I usually run a stock rubber style bushing on the rear end housing OR a spherical.
View attachment 184078
I really prefer these but to some people they so transmit more noise..I usally use a poly in the rear housing or spherical.
View attachment 184079
Heres a spherical and reg poly housing bushing for you that may or may not know what Im talking about..these are installed into the rear end housing and are at the attachment point for the rear upper control arm.
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ALL ABOVE IMAGES ARE FROM UPR, I am not paid by UPR in any way but I am proud to be a dealer and user of there products.
Here's a Steeda adj upper arm...used them with no issues, great product.
I use these personally on my own car, I actually run a entire set-up from Team Z Motorsports on the rear of my car. I would use the UPR if I didn't already have these components. Dave is a top notch fabricator and
suspension tuner, and I bought these when Dave was first coming out with them for at the time my NMRA Drag Radail car. This is a RACE SET-UP. You'll notice the solid bushings that go into the rear housing. Id also run ANY product Team Z produces, Dave is one of the best fabricators I have ever met and he is a helluva man.
There is a ton of theory and design in rear
suspension and it is all dependent on what you do with the car. The anti squat ration, Instant Center, Ride Height, Weight, Tire etc...all come into play.