PJSnow

There are quite a few part numbers for the bushings and the only difference appears to be offset. Can anyone explain the offset (what it does and why its needed/not needed)? Also, the part numbers from the official Lexus Parts website (https://parts.lexus.com/) are different and don't list an offset.

Passenger Side (both RCF and GSF)
48075-24010
48075-24080
48075-24090
48075-30030 (0 Offset)
48075-30040 (+20 Offset)
48075-30050 (-20 Offset)

Driver Side (both RCF and GSF)
48076-24010
48076-24050
48076-24060
48076-30030 (0 Offset)
48076-30040 (+20 Offset)
48076-30050 (-20 Offset)

dteskmo

I bought the RR bushings and found the NVH to be unbearable, and required lubrication too frequently to get rid of the squeak. Switched to FIGS bushings (90 durometer) without the bracket for less than half the price (Ebay was cheapest, shipped from Australia) and had a shop press them into my brackets for 1/2 hour charge. NVH is minimal, and I have had only one squeak in the last two years (which happened on a VERY cold winter day). The GSF/RCF option is best if price is the most important factor.

It is worth mentioning that I had to buy a torque wrench that can go up to at least 150 ft-lbs to do the install myself, so an extra cost that some people might not realize. It is also worth mentioning that there is a softer, 80 durometer, version from FIGS (made by SuperPro) that might be comparable to the GSF/RCF bushings.

Sasnuke

The list above consists of the Lower Control Arm bushings for the GSF/RCF as well as the GS/RC/IS. I put a strike through the part numbers for the regular bushings that the IS already comes with.
So now you're left with only the GSF/RCF bushings.
The offset is in relation to Caster...the forward or rearward position of the front wheels in relation to the vehicle.
In reality, most everyone will be ordering the 0 offset bushings.
The only reason you would order either the +20 or -20 offset is if you need to correct the Caster angle.
Reasons you would need to correct the Caster angle? The vehicle has been in an accident and the front caster is out of spec. Or, you've made suspension modifications that have some of the alignment specs out of the specified range by the manufacturer.
If you've had an alignment recently done and the Caster was fine, just get the 0 offset bushings.

PJSnow

Perfect! Thank you for the thorough response. Much appreciated.

JNP1227

iTrader: (1)

After Driving 21,000 on the RR USRS bushings, I have to say they perform GREAT. Only downside of these bushings is they SQUEAK! I have had them pressure washed cleaned and lubed and the squeak comes back. Not to mention they also cause more stress on other suspension components which may/may not be squeaking. If had to do it again, would have saved a few pennies and bought the RCF/GSF ones since its aimed more towards daily use.

s3v3n

iTrader: (3)

Do you have a RWD? I just have them installed last Monday and noticed a difference in driving - car drives straight like an arrow and it's a bit heavier in city driving. Had to really hold it now to make a turn.

When you did you start hearing the squeaking noise?

Pittsy

How often does the RR USRS require lubrication?

s3v3n

iTrader: (3)

During the first install. I was directly told it doesn't need re-lubrication. I'm sure some people with USRS will share other opinions based on their experience.

Pittsy

Ok awesome! Id like to hear from other USRS users as well, but Im very interested in pursuing it. Was told that it'll drastically change my track experience.

jkonquer

I noticed the squeak when it is around 40 F degrees. I live in socal, so only time I notice it is on the way to work at 5 am during the winter season. I don't hear it during the day or during the summer.

jkonquer

It does feel much stable compared to the stock LCA bushings, everything feels more planted and direct. But if you are tracking these vehicles, LCA arm bushings are the least of your worries.

From what I was told by RR-Racing, there isn't much of difference between IS and RCF bushings, so I went with the USRS to eliminate the inner wear. If you can get more than 30k miles out of the RCF bushing, I would get those instead of the USRS.

Flash5

Of course RR would tell you their product is better. I have no doubts their bushings make the steering response so much better, but for the fixing inner tire wear that’s HIGHLY debatable. The RCF LCA bushings mitigated the inner tire wear for me so.....

s3v3n

iTrader: (3)

I just switched from RCF LCA to USRS and I can tell that the steering response is heavier. In addition to this, the car does not wander around now (I feel like my alignment is always messed up with the latter. USRS fixed this issue and car now drives straight like an arrow.

Very noticeable difference in my experience is the tightness is there now, very close to a typical BMW steering feel. Now with regards to the inner tire wear, I know the RCF LCA prevented it but not completely fixed it and I will see it if USRS will also do the job, if not surpass it.

I'm keeping my RCF LCA just in case the common squeak issue happens. I currently have the 70 durometer USRS. RR racing installed it for me and I'd rather keep this than to go back to RCF version.

flowrider

iTrader: (9)

^^^^The squeak won't happen if the bushing is lubed properly. With time, years, a squeak may develop, and relubbing may be necessary. The USRS was one of my best mods when I had my ISF. Highly recommended

Lou

s3v3n

iTrader: (3)

I was told directly that there is no relubbing necessary.