I can't remember if? Do you still have the stock Sway Bars?

 

He has Hard Race front, and Superpro rear upgraded sway bars.

 

Yep, and the rear is on the tightest setting.

 

Refreshing the engine/trans mounts is a good idea even if there isn't any visible cracking, because the rubber will be degraded at 130k regardless. Take some before/after videos of the engine movement and you'll see what I mean. In my case every single suspension bushing had small cracks forming at 130k that were plainly visible at full droop.

Strongflex makes almost everything for these cars, I have everything from them but with a few modifications to some of the bushings to account for the AWD component differences (AWD front LCA AND UCA are different from RWD). Also used (and modified) some MK4 Supra diff bushings because I wasn't crazy about the design of the rearward position ones from SuperPro. Biggest problem is that nobody makes rear subframe bushings (these are likely more responsible for the driveline slop you feel than the actual diff bushings are), so I made my own out of aluminum, same for the steering rack bushings (the rack should've been hard mounted to begin with, the subframe mounts I would've just used 80A or 95A durometer polyurethane if they existed).

 

I hear horror stories how poly bushes squeks like mad after a while, thats what putting me off from changing to them. Are they true? Would love to get feedback from real users. TIA.

 

Lots of creaking noises with articulation, very noticeable under 20mph before tire noise drowns it out, wouldn't recommend if you value low noise over cornering performance (in that case just get some new OEM rubber bushings or complete arms from Lexus, not sure how they're sold). Part of it could be my own fault with inadequate grease in places, zipping everything together quickly with an impact, greater acoustic conductivity with the solid subframe mounts, or the air bladders shifting around in the rear springs, but the bottom line is yes they make noise. I think it would be a bit quieter if more of the bushings from Strongflex were available as 80A durometer, most are available only as 95A durometer. Their logic is they offer a choice of 80A or 95A for soft rubber bushing positions, and only offer the 95A for hard rubber bushing positions (which is our case is every single rear arm).

 

Noted with thanks!

 

Wow, just went on their site and saw plenty I could use especially in the rear. Thanks for the suggestion, I had no idea that company existed. Sounds like youre pretty handy with making some of those parts, I may just go factory for those that cant be found in an aftermarket comapny.

 

I've had poly LCA bushings for a few years and I haven't noticed anything in terms of noise.. these in the rear are just installed but still nothing out the ordinary.

 

Something easy you can do if you opt for new OEM rear subframe bushings is fill the voids in the rubber with a liquid polyurethane kit (use the highest durometer you can find for this). It'll still be softer than what would be ideal given the extremely soft rubber (similar to the OEM front LCA rearward position bushing rubber), but it'll help somewhat. I don't think Lexus will sell you the steering rack bushings, pretty sure the only way to get those OEM would be buying a new rack.

Here's a video of my rear diff and subframe prior to changing anything, use the plastic underbody panel in the lower left corner as a visual reference for movement since it's mounted to the chassis (and the camera is mounted to it): https://i.imgur.com/sImCp02.mp4

The subframe is visibly pitching on acceration, z-axis movement was definitely the single biggest problem, not to say that the degree of lateral and longitudinal movement was acceptable. Still need to get a final "after" video clip with everything done. I only have an initial "before" and one with just the differential bushings at the moment.