That Toyota explanation is some bullshit for sure. 3500RPM is already more than 50% of the available RPM band. It also does not explain the vibrations completely disappearing when pulling the handbrake or when the drivetrain is still cold.
I've just done 350 miles today, mostly motorway so had a good opportunity to check out all combinations of 4th, 5th and 6th at light, medium and heavy throttle from 2000 rpm to 4000rpm. I couldn't feel any untoward vibrations in any circumstance. Obviously pleasing for me but I don't doubt others are feeling something different ( and worse) with their cars. So for what it's worth I don't agree that they all do that - mine doesn't!One person's hum could be another person's bag of nails I guess
This is how I'd describe mine too... Probably wouldn't do it if I dropped a gear. Noticeable from my very first drive (12 miles in the clock)I spent a couple of hours in my car at the weekend, albeit the majority of the time on some of Wales' finest B roads.
The only time I noticed a shudder or vibrations was when I was in too high a gear to make reasonable progress ie. so doing 40 in 5th or 6th and driving through the torque peak, which in normal driving I would probably change down a gear or two - probably why I've not really encountered the problem.
ALL have this 'vibration' in common; particularly when the engine is not kept on the boil and working hard.
Fine work. Look forward to hearing the results (or not).Today I got a hint in a Facebook publication from a guy selling the Cusco diff support silentblocks or rings or whatever that piece is called. He is selling them because the car vibrates from 3000 to 3500 when applying throttle! So... As I was thinking last week, there has to be something wrong with the rubber support from Toyota. Pics below of the cursed pieces.
I've already talked to the dealer again and I believe they will change them asap.
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I admire your persistence.I've been to the dealer and have some news.
Toyota Europe is now investigating seriously the issue as there is many people in Europe with this problem. So, with my test they discarded the diff issue and now are doing something else with another car.
The dealer will send the information about this peace I've pointed out in order to have it changed or at least give them some ideas... I believe that by the end of summer we will have the solution to this !
Is it possible to overtighten that fixing bolt and top hat ?You could be onto something, rubber parts can have quite a wide tolerance on their stiffness properties. Seems a reasonable theory that the diff mounts on your car could be at the stiffer end of their spec.
If not it could also be a slight misalignment in the installation of the mounts. If they’re slightly out there could be some wind up in the installation