I don't know what "known" means exactly. I mean... I know that theres issues. And i've tried to let other people know that there are issues. According to the tech guys at TT, they more or less know its an issue but won't address it.
The rubber bushings don't last. I went through 3 sets. The 3rd set lasted 3 weeks.
Look at every other coil over on the market. Do they have rubber bushings or spherical heims? This is HUGE. I can't emphasize how big of a deal this is.
Also look at how the BOSS adjusts. You have to take the wheel off to adjust the collar because they're at the bottom of the strut.
Look at every other mfg.... adjustment collar is at the top. No takey wheel off.
It's great for mall crawling. But it doesn't hold up to washboard or rocky trails, wheeling. I could post photos in here that would freak ya'll out.
Really its the bushing. It's a poor design and the bushing is the weak link. Toyota engineer's designed the strut to work with that bushing for a OEM suspension. The valving and spring rate on the BOSS is not the same, and the bushing compresses when the shock should. So the rubber in the bushing gets obliterated.
Oh and unless you want to put the BOSS back on your truck, don't expect a lot of support from TT. I had a strut completely destroy itself as a direct result of the bushing BS and they only offered 10% off an upgraded product.
Gee thanks for the support TT. I bought your suspension and pulled my struts 4 times to press in more lame bushings, plus the cost of bushings, and you're gonna offer me 10%?
No thanks. Way way better options out there for a little more coin.