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I don't think it is the rear shafts. I made a video showing parts of the tailshaft and right rear driveshaft as I drove on the freeway, and they ran true at all speeds. I had also inspected them by hand when I did the rear bearings, and they seemed good. They don't get subjected to the angles that t...

Update: the Whiteline bushing arrived today and I put them in with high expectations, but the reverse happened - the vibration seems to be much worse now! The new bushings are pretty stiff, so it seems that the old half broken ones were absorbing vibrations rather than causing them. I checked that t...

Thanks for the ideas. The car was running increasingly rough in the last week or so, which made the vibration much worse. So yesterday I did the arduous task of changing the plugs (and using an injection cleaner). Engine is now silky smooth and the vibration is much reduced, though still there. Part...

Perhaps it could be the rear driveshafts, but they seem fine with little slop. I was thinking of making a video of them with a GoPro from underneath while driving to see if they run true. Also, most of the things were done after the vibration started, in an attempt to alleviate it. Only the front wh...

I'm running out of ideas to fix a persistent vibration in my auto H6. Symptoms are: 1 Occurs at various speeds, most noticeable above 40kph. 2 Putting it in neutral does not seem to help, though perhaps a little. 3 Vibration is reduced when under load or accelerating. 4 Whole car vibrates, but not s...

Subaru parts has a solenoid valve assembly for the transfer clutch with inbuilt sensor that sits on top of the housing, held in by 4 bolts, for $180. The sensor is nor sold separately. Does this sound like the right part?

Thanks for the reply. Which sensor are you talking about and where is it? I'm no thinking that the jerk comes from a downshift on decelerating, not slop in the centre diff. I did a test drive, and there is no jerk in 1st or 2nd (or neutral as I mentioned), but there is a consistent jerk in 3rd and 4...

Does anyone have experience with apparent looseness in the H6 centre diiff/transfer clutch? I have the slop shown in this video (though this is not my car): http://www.youtube.com/watch?v=Ndh2aiE1VI8 The effect is a noticeable jerk when slowing down, just before the car stops. If I shift it into neu...