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Old 07-24-2019, 03:20 PM #61
SoFloT4Run SoFloT4Run is offline
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I doubt that the differential will be the culprit as i have also experienced the infamous shimmy. Mind you, i have a 2WD SR5......Soo
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Old 07-24-2019, 03:29 PM #62
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Quote:
Originally Posted by SoFloT4Run View Post
I doubt that the differential will be the culprit as i have also experienced the infamous shimmy. Mind you, i have a 2WD SR5......Soo
OP has vibration..not shimmy, two different things in my book.
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Old 07-24-2019, 04:21 PM #63
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Quote:
Originally Posted by pumacat24 View Post
Not yet.

If they fix it, I will request a TSB for everyone elseís sake.

Or Iíll send you my paperwork as proof if it helps get work accomplished on your T4R.


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Wow that's a lot that they're changing... hopefully something comes of it. Good job getting that far with them! I wonder if the TSB would include replacement of the axles, wheel bearings, and the front differential or just the differentials since that's what they claim will be the ultimate fix. Anyway, if a fix does come with it, we would love the paperwork to bring that up with our dealership. Thanks for your persistence
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Old 07-24-2019, 04:31 PM #64
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Quote:
Originally Posted by laurabalaura View Post
Wow that's a lot that they're changing... hopefully something comes of it. Good job getting that far with them! I wonder if the TSB would include replacement of the axles, wheel bearings, and the front differential or just the differentials since that's what they claim will be the ultimate fix. Anyway, if a fix does come with it, we would love the paperwork to bring that up with our dealership. Thanks for your persistence


Thanks, if itís actually fixed and ready Friday, that will be the 19th day without my car.

It will be worth it only it is is truly fixed AND we can get a TSB for the rest of you who have the same issue.

If itís not fixed I think itís time to move on to a new T4R.

Driving this loaner Corolla is cramping my style.... and the fact that Iím still paying for my 4Runner. Do any KDSS (or susp. upgraded) owners have steering wheel vibration? Please Respond!


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Old 07-24-2019, 05:47 PM #65
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Does it go away in 4hi? I assume that's their theory, but that doesn't mean it's the differential. I'd say it's exceedingly unlikely that the differential is the problem. If it does fix it, I'll be really impressed.
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Old 07-24-2019, 10:05 PM #66
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Seems like if they are able to narrow down the culprit, it would be an expensive fix for anyone out of warranty. Incidentally my warranty expires tomorrow. Guess I should have paid for an extended.
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Old 07-24-2019, 10:21 PM #67
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Quote:
Originally Posted by ellroy2 View Post
Seems like if they are able to narrow down the culprit, it would be an expensive fix for anyone out of warranty. Incidentally my warranty expires tomorrow. Guess I should have paid for an extended.
The reason that I think it's unlikely that the differential is causing it is because the only connection from differential to the steering assembly is CV shaft. The CV shafts are built so that they have a fairly decent amount of extension and compression travel with very low friction. So I don't think that there is a mechanism by which the differential would cause exterior feedback issue unless something like a spider gear or seizing was causing the issue. Generally if that happens you'll know right away and it will be very obvious. I suspect the reality is that it's simply a complex system with an inherent resonating frequency. My bat is that something as simple as changing the density of the rubber in the bushings would be enough to fix it, why don't we take a fan out of testing to sort out that type of fix. I would be very curious to know if simply switching the lower control arm bushings to poly bushings solves it.


Given Lexus fixes it with more dampening in the steering box I'm surprised they didn't start with a known fix.

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Old 07-25-2019, 08:01 AM #68
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I know you have ruled out the tires and wheels. I have driven a runner with the vibrations on a test drive. Mine has zero vibrations, however, I did get the steering wheel vibration when I did my first tire change and they were the LTX tires done at a local shop. After a few back and forth trips I finally went to the dealer, who had just purchased the newest balancing equipment. With persistence, they were able to make it smooth as butter. I am now on my 3rd set of tires, KO2's. this time i had dealer install and insisted on the road force at install. Zero vibrations. Not to beat a dead horse, but maybe the dealer tech is not well versed in balancing. Just a thought. I didn't have it, then I did, now I don't. I know it was the same vibration I experienced on the test driven vehicle. I hope you can get it straight and don't have to ditch the truck. I'm at 177,000 miles now. I'm not understanding how some can have it and some don't when comparing apples to apples. what could be done differently and vary per vehicle other than balancing and alignments?
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Old 07-25-2019, 09:11 AM #69
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Quote:
Originally Posted by Jetboy View Post
The reason that I think it's unlikely that the differential is causing it is because the only connection from differential to the steering assembly is CV shaft. The CV shafts are built so that they have a fairly decent amount of extension and compression travel with very low friction. So I don't think that there is a mechanism by which the differential would cause exterior feedback issue unless something like a spider gear or seizing was causing the issue. Generally if that happens you'll know right away and it will be very obvious. I suspect the reality is that it's simply a complex system with an inherent resonating frequency. My bat is that something as simple as changing the density of the rubber in the bushings would be enough to fix it, why don't we take a fan out of testing to sort out that type of fix. I would be very curious to know if simply switching the lower control arm bushings to poly bushings solves it.


Given Lexus fixes it with more dampening in the steering box I'm surprised they didn't start with a known fix.
i also don't think this is the main issue, but my ride is smoother with a new diff (mpg is better too) and according to my service rep wear on the internals, i assume the spider gears, is why toyota changed the TSB from just replacing the needle bearing to replacing the full diff - so i think it could possibly be a contributor.
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Old 07-26-2019, 04:38 PM #70
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Update:

Front diff did NOT arrive today.

Hopefully Monday Iíll have a positive update after installation.

Do any KDSS (or susp. upgraded) owners have steering wheel vibration? Please Respond!


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Old 07-26-2019, 05:15 PM #71
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2018 TRD ORP with KDSS. Smooth as silk factory, and smooth as silk post-lift with stock wheels and tires.

However, I do get pretty decent steering wheel vibration at highway speed with aftermarket wheels and tires. 275/70R17 Falken Wildpeak AT3W and Method Roost wheels. Vibration mostly goes away after a while.

It's definitely due to bad balancing on one of the wheels though. They put a ton of wheel weight on one. If I get them rebalanced at a place that does a better job it would go away.

Just one more data point.
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Old 07-29-2019, 11:58 AM #72
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Do any KDSS (or susp. upgraded) owners have steering wheel vibration? Please Respond!

People!

I have an update and no, my car is not fixed yet, but these two things could be BIG news...

1 - The front differential was replaced on my car for a completely different and non-related reason. I know... WTF? I do not exactly know why but I was told they are having issues with some and went ahead and replaced it with a ďupdated versionĒ. My mind is still boggled on the one.

2 - POSSIBLE BIG NEWS MAYBE A FUTURE TSB!?!

Look what is NOW available for 5th gens... STEERING WHEEL DAMPER:

2018 Toyota 4Runner TRD Off-Road Premium Steering Wheel Damper. Damper, Steering SHAKE. Brakes, Suspension - 4571360070 - Genuine Toyota Part

This steering wheel damper was only still available for 4th gens when I looked for one 2 months ago.

The dealership is now waiting on this part to arrive. The bad news is that they have no ETA yet as I assume I must be one of the first to receive it from Japan.

Yes, Iím assuming these things here, but I know if this had been available before now you if you lovely, educated people would have said, ďHey Cat, why donít you throw a steering wheel damper on it and call it a day?!Ē

I told them I need an ETA today because my patience is now at ZERO since I have now been 22 days without my car. (I also said how appreciative I was for all of the help and assistance, Iím not mean about it.)

IF THIS FIXES MY CAR, I WILL REQUEST MY DEALER TO MAKE A TSB FOR IT.

Well. Thatís all for now kids.

Will update as soon as I know something else.


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Old 07-29-2019, 06:05 PM #73
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Wow. 22 days without your 4R. If they donít get it fixed in 30 days will you try to start a ďLemon LawĒ case to get a new vehicle?

I wonder how that steering damper works. The drawing at that link makes it look like itís already an integral part of the steering wheel, for many model years. The one they ordered for you, are they saying your truck already has one and itís faulty, or is this a newly available part Toyota designed to address this vibration type of problem?
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Old 07-29-2019, 08:19 PM #74
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FORTUNATE & UNFORTUNATE UPDATE:

After I got off of the phone with the dealership this AM trying to get an update on the status of my car, the owner of the dealership called and Toyota will be replacing my car.

Not sure how the process will go, but I was sincerely hoping they would fix it and be able to issue a TSB for everyone else suffering from the same issue.

I'm going to start another thread about Toyota replacing my car and the process of how it works and to see if anyone else has been through this.

I'd like to know if anyone has any tips or suggestions on how to proceed once Toyota contacts me about this issue.

Sorry to all who were hoping I'd be able to post a fix, I was really hoping to get a couple bottles of liquor sent my way! hahaha

Also @ElectroBoy , I do agree with you on that it already looks integrated, but I firmly believe they would've tried to replace that first instead of everything else they replaced since it seems like a much cheaper and easier fix... but who knows? I know I couldn't find one of those for 5th gens when I search 2 months ago. Strange.

At any rate, best of luck to everyone else who has this issue, and I'd be glad to hep you all in any way I can, just shoot me a DM or post on this thread.

Hopefully this issue will be sorted out by the time the 6th gens arrive.

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Old 07-29-2019, 10:45 PM #75
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Disappointing for the rest of us but good for you for pushing this issue with Toyota and getting to where you did. I guess Toyota would rather hand out a new 4Runner here and there than actually put the effort into solving this. Hopefully your new ride will be vibration free. Keep us posted.
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