broken4door, I replied to your email, please let me know if you didn't receive it!


In response to a number of questions received:

The rubber bushings on the subframe links do more than just locate the wheel carrier... they are bonded rubber bushings, which snap back to the static position when pulled up or down. This is integral to the rear suspension functionality. If you replace these factory links with adjustable links (none of which have bonded rubber bushings), the suspension loses this additional "return to center" function, and it causes serious handling problems. In general, you don't want to use these adjustable arms - even the ones which have rubber bushings are NOT bonded rubber bushings like the factory items; they may not make noise but they also won't bounce back. Here is a link to a video (10MB) showing how the suspension bounces back to center, with the coil spring removed and shock disconnected:
http://www.w124performance.com/movies/Mercedes/rear_suspension_rebound.mpg

At first, I tried installing just an adjustable camber arm, and ended up with wheel hop during a burnout. Reverting back to stock cured the problem. That's when I installed the K-Mac kit, which worked OK other than the squeaking & ride height issues. The RDM TEK solution cured the K-Mac problems, and only gave up adjustability... I still had a decent -1.40° rear camber with the car lowered.

Anyway, the K-Mac kit doesn't really offer additional stiffness (from polyurethane vs rubber), and IMO there's no need for additional stiffness anyway. If any of the rear bushings are old or worn, new factory items should bring things back to normal - the subframe bushings are usually toast after 15-20 years. I still highly recommend the RDM TEK shortened rear LCA's as first choice for rear camber correction. If you really need rear camber adjustment (for race/track use, etc) then I would recommend K-Mac as the next option. I do NOT recommend using any adjustable links, for camber or any other arm, no matter if they have Heim joints or rubber bushings.

BTW - here is a video showing the squeak noise from the K-Mac bushings. It seems quite loud in the video since the camera is right next to the bushing and there is almost no ambient noise to help mask the squeak:
http://www.w124performance.com/movies/Mercedes/K-Mac_squeak.mpg

I purchased my K-Mac kits from Shox.com, btw. Click here for photos of the K-Mac installation process. It's far more work than installing the RDM TEK LCA.

Finally - here is a link to the RDM TEK website:
http://rdmtek.com/Rear_Suspension.html