This is main thing I try to convey to people when I talk to people about wheel hop. Wheel hop is very unique issue and there is no one magical part that takes care of the wheel hop issues these cars so nototriously have. Different cars take different parts depending on power level, transmission type, tires, road conditions, weather conditions, etc, etc. Due to this I really like to attack the wheel hop in stages to keep the parts and cost to a minimum. I generally recommend trailing arms and outer trailing arm bushings as the first stage because they are very affordable, the install isn't too bad, and they generally make a decent difference when it comes to wheel hop. If the trailing arms and outer trailing arm bushings don't do the trick I like to move on to the toe rods and rear cradle bushing kit because the rear cradle has to be lowered to install these parts so it is ideal to do them together. Axles will also help out with wheel hop but the price of them can be a hard pill to swallow so most of the guys we deal with hold off on them. Basically anything you can do to control movement in the rear end/rear cradle/rear suspension will help with the wheel hop.There is no one single mod that will cure wheel hop. Every car need cradle bushings. Add toe links and trailing arms, and it cures most vehicles. The more power you make, the more mods it will require to control the hop
The rose joints in the ZL1 toe rods are definitely an upgrade but the problem is that the body of the toe rods is still manufactured using stamped steel and is still prone to deflection under heavy loads.I started with your Sub-frame mount inserts, and after installing my choices of King HD SL springs and Bilstein shocks, I have been working on sorting out the rest.
I am looking at options that allow the controlled two-axis movement needed and I am not a fan of polyurethane bushings - no 2-axis movement and deforming/flow issues when pushed hard. For the toe rods - I am thinking about the GM 1LE/ZL1 part 22845487 - the factory style spherical bushings should be a good upgrade..
The trailing arm outer bushing is a hard one. I could go with your trailing arm with the spherical inner bushing but that still leaves the outer as stock or poly..