My gearbox has jerked...

Good evening, everyone.

after now more than 294,000 unobtrusive and unscathed km my gearbox (5HP24, FBG), initially developed very delicately, then increasingly the property, in the range just below 2000min-1, only with gentle acceleration or even uphill driving, to show a short rucking, felt as if the converter bridge coupling rupfe.


After observing this for a while (for weeks) with steadily growing discomfort, and more and more I came to the conviction that there might be a greater disaster here, I went over to the counterattack, put the computer to the car and went on a test drive, and .... nothing, except the jerking of course, which I could now deliberately provoke.

No error entry, transducer bridge coupling opens, regulates and closes as it should, so diagnostically everything smells, if there were not the rutting. ( The tumbling itself cannot represent the diagnosis because of the lack of sufficiently fast data rate )

So, step two, starting to look around the net, and look, each
Lots of posts about ruttering tiptronics available!

But, ALL I found, not only had a jerking, but also hard shifting, beatings from forward to reverse, different behaviors cold and warm and all sorts of other infirmities.

Mine had nothing of all this, switches like ever gently to imperceptibly, whether cold or warm, by hand, on S or D, it just jerks for a short time.

And as always, and as always annoying, ALL widen their problem, then come
a lot of dangerous semi-knowledge or even of any technical knowledge of undisturbed nonsense as answers and in the end you usually do not know what was the reason for this, any objective knowledge gain is thus successfully prevented.

And then a screwdriver, whose skills I appreciate, recommended me to have my gearbox flushed according to the "Tim Eckart Method", and as chance would have it, he knew a friend workshop around the corner, which was able to do exactly that.

I read through the various contributions on the web and also here I did not find exactly the same problem described, which could be solved by a flushing or sometimes not solved.

But, I thought, after so many miles, there can be no mistake in changing the filter at the gearbox, cleaning the tub with magnets and changing oil, and I promised myself less of the actual flush than secretly had the hope that my problem might be seen in the extracted oil pan in the form of chips or abrasion.

Said, done, and, of course, the old oil wasn't even black, and there was nothing to see in the tub or on the four magnets that could have suggested a defect, crap!

And then, with fresh filter and fresh oil, the absolute surprise, the jerking has disappeared, can't be caught!

Conclusion, I don't tend to be a miracle believer, I'm always skeptical when something is exuberantly praised and advertised, but here, in my particular case, I had to learn.

I also have an explanation of what caused the tumbling, also because it fits in time.
I suspect that, on the occasion of a workshop stay, someone was filling the wrong oil in my gearbox with good intentions, which meant that this proportion of false oil changed the properties of the existing oil so that it was tugging, in fact, a really pounding converter bridge coupling.


I wanted to share that with you if someone encounters the same problem and then as I find a lot of comparable contributions on the net, but no solution or at least plausible explanation.


Roland