Caster Issue: what to replace and what order? - Lexus IS Forum
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post #1 of 14 (permalink) Old 05-16-2016, 10:48 AM Thread Starter
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Caster Issue: what to replace and what order?

Hey guys, I've already done a lot of reading into the forums on my problem, but just want to know what y'all think.

Front caster is out of whack, been that way for a while. Wheel sits noticeably towards the cabin vs the passenger wheel which is in spec for caster. Something is probably bent, but what? I have looked at the suspension and can't really see any clear signs of what is bent under there, nor could the head guy at the alignment shop. From my reading, seems like the first step is to replace the lower control arm, as that seems to be most responsible for caster. But what do yall think? What would you replace and in what order? Any help is appreciated as this is the last thing keeping me from getting my alignment all squared away.

04 IS300 MSM LSD Manual
-XS Power Turbo kit -Emanage Ultimate Tune
-SSR Type C 18x9.5/10.5 +20
-TRD Coilovers -TRD Sway Bars -CDD Delete
-Plastidip black Handles, grill, and stripe -
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post #2 of 14 (permalink) Old 05-16-2016, 11:35 AM
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I'd take the bolt out of the compliance bushing (#2 bushing) and see if it's bent. Agreed that the rear part of the lower control arm controls castor. The compliance bushing, which commonly fails on these cars would actually be the first thing I'd probably change.
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post #3 of 14 (permalink) Old 05-16-2016, 11:43 AM Thread Starter
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Thanks for chiming in, I was actually hoping you'd leave something here. You seem to know a lot about everything for this car haha

04 IS300 MSM LSD Manual
-XS Power Turbo kit -Emanage Ultimate Tune
-SSR Type C 18x9.5/10.5 +20
-TRD Coilovers -TRD Sway Bars -CDD Delete
-Plastidip black Handles, grill, and stripe -
-Black Housing headlights and tailights
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post #4 of 14 (permalink) Old 05-17-2016, 02:46 PM
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I replaced my #2 LCA's.. Rockauto has some fairly inexpensive ones. I honestly doubt that bar is bent, unless you go into a huge accident.

Do you hear any clunking when you're going over bumps? The bushing may be shot, which is common. To replace them, I would just buy the FIGS Caster Arm bushing.

2003 Millennium Silver IS300
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post #5 of 14 (permalink) Old 05-21-2016, 03:05 PM Thread Starter
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So no clunking, I took some pics of what's under there. I'll post some pics up in a bit. Basically, there seems to be a gap between where the LCA connects to the subframe.

Pics:






So the other arm had no gaps, so I suspect this is the issue. I don't know cars like I'd like, what would be y'alls diagnosis? Control Arm? Bushing? Something else? Thanks!

Last edited by Be.Parker; 05-21-2016 at 03:14 PM.
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post #6 of 14 (permalink) Old 05-22-2016, 01:35 PM Thread Starter
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Bump for help please!!!!
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post #7 of 14 (permalink) Old 05-22-2016, 02:52 PM
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I don't really see an issue. That adjustment is for camber though. You can replace those bushings with "Fits" poly bushings. It's probably the easiest way to take the bushings out of the loop.

I was hoping you had pics of the rear bushing. It's what changes caster.
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post #8 of 14 (permalink) Old 05-22-2016, 04:47 PM Thread Starter
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So it seems I'm more clueless than I thought. Where can I find that bushing?

OK, the noob found it. I'm at work and just jacked up my car real quick and snapped some pics. Any input? Thanks again guys, much appreciated, especially @Ek9B18.







In other news, so glad I got a new phone, motorola x pure. This camera is SOOOOOO much better than my last one. 5mp vs 21mp.... hahaha

Last edited by Be.Parker; 05-23-2016 at 02:39 PM.
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post #9 of 14 (permalink) Old 05-23-2016, 02:42 PM Thread Starter
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Bump to get it into active topics for addt. help.

04 IS300 MSM LSD Manual
-XS Power Turbo kit -Emanage Ultimate Tune
-SSR Type C 18x9.5/10.5 +20
-TRD Coilovers -TRD Sway Bars -CDD Delete
-Plastidip black Handles, grill, and stripe -
-Black Housing headlights and tailights
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post #10 of 14 (permalink) Old 05-23-2016, 04:09 PM
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3rd picture down on the new set. There's a strange blemish on the arm that goes to the #2 bushing. Almost looks like it's bent a little.

It's hard to tell what kinda shape the #2 bushing is in. The #2 is what governs castor. It seems to be OK. Might look at the other side to compare.
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post #11 of 14 (permalink) Old 06-01-2016, 07:44 AM
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The #2 bushing looks torn and push out of the center. I highly recommend the Superpro bushing kit SPF3040K to replace the stock rubber ones. I have 1 set in my IS300 and am about to put a set into my Altezza.

Adam
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post #12 of 14 (permalink) Old 03-23-2017, 10:59 AM
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When you buy the Superpro bushing kit SPF3040K do you have to buy two sets one for each side?
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post #13 of 14 (permalink) Old 05-24-2019, 02:45 AM
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Hello, if you’re still looking for a solution look up front adjustable caster rods on offerupnow.com
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post #14 of 14 (permalink) Old 05-24-2019, 04:47 AM
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Quote:
Originally Posted by daskiai View Post
Hello, if you’re still looking for a solution look up front adjustable caster rods on offerupnow.com
Should put this in the https://www.my.is/forums/f99/ and sling your stuff on someone else's treads. Follow the rules.

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