Polyurethane rear control arm bushings?

[ax53]

Have anyone tried polyurethane bushings in the rear LCA?

https://rankoneperformance.com/collections/lexus/products/lexus-is200-is300-altezza-rear-knuckle-poly-bush

Is it worth it? I've replaced mine with Febest but the suspension is still knocking. I've also replaced the shocks and swaybar drop links. All of which I thought would cause the sound. But it's still there. So I figured maybe the Febest one was just trash? So again, anyone have any experience with these poly bushings?

Thanks.

 

[Lwerewolf]

The only other option that I'm aware of are the FIGS bearings (yup, this part is a heim joint, spherical bearing, however you wanna call it). I'm not sure if Jikiu (and other brands) are anything different. There's plenty of possible knock sources on the back of these cars, though - two ball joints (upper control arm, toe link, ignoring end links as you've changed those) and all the bushings, including the subframe ones. Of course, could be that the Febest ones are bad, too.

[ax53]

8 hours ago, Lwerewolf said:

The only other option that I'm aware of are the FIGS bearings (yup, this part is a heim joint, spherical bearing, however you wanna call it). I'm not sure if Jikiu (and other brands) are anything different. There's plenty of possible knock sources on the back of these cars, though - two ball joints (upper control arm, toe link, ignoring end links as you've changed those) and all the bushings, including the subframe ones. Of course, could be that the Febest ones are bad, too.

The reason why I'm interested in the poly bushings is because I find these spherical bearings to be a bitch to install. I'm not super keen on doing it again if the Febest bearing is bad.

About the sound, both the outer LCA bearing and the swaybar drop link has been making sound when pushing down on the suspension by hand. And the shocks were blown. But non of that helped so far. It's only making sound on small, sharp bumps. It sounds almost as if the shock rod is loose, but i know it isn't. It doesn't make any sound from turning hard or from accelerating. So I don't think it's any of the small arms. Possibly the toe arm in that case.