Suspect auto box on Allroad 2.5 please noooo

[mike ryan]

On the way into work this morning I noticed my car exhibiting some funny behaviour. It’s a 2.5 tdi Allroad with a tiptronic fitted. The symptom is that when in 5th at 80 my rpm is now higher than normal. When I ease off the throttle the revs drop without the speed reducing. It is just like a clutch slipping on a manual. I know this all points towards slipping of one clutches in the gearbox but wanted to check if anyone else has another solution. The box I have noticed does seem to surge when cornering as if the box cant make its mind up what gear I should be in. this may be linked I am not sure. I have taken the box out the car once and it’s not for the faint hearted so want to be sure before I commit to it again. I have not done a scan yet as my lead it is at home. Will update you on any results I find.
Looking forward does anyone have an idea of price for a rebuild of the box. I want to try and keep the car going so don’t mind putting a bit of money into it. Not keen on a second hand one as it is potentially as bad as mine.

Cheers Mike


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[rich81]

Hi Mike,
That's most likely the torque converter unfortunately. Not able lock up. If you scan it there will be a fault code relating to this. It is a common failure due to a seal that goes in the TC.

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[mike ryan]

Yes I am inclined to agree as I have been doing some digging and I reckon the lock up on the tc may be gone. Is this likely to be the solenoid or the tc that needs replacing?

Second point is that I know of an a6 2.5 quattro in the scrap yard currently and was thinking of getting that box to overhaul and then just do a swap. Is the allroad box any different to the ordinary a6 ones? I will try and get the codes for the box from it later


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[rich81]

Yes I am inclined to agree as I have been doing some digging and I reckon the lock up on the tc may be gone. Is this likely to be the solenoid or the tc that needs replacing?

Second point is that I know of an a6 2.5 quattro in the scrap yard currently and was thinking of getting that box to overhaul and then just do a swap. Is the allroad box any different to the ordinary a6 ones? I will try and get the codes for the box from it later


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Providing it's a Quattro car I would imagine it's the same box, but worth checking the codes. From what I've read it's almost always the TC that goes bad hence gearbox out job. Good luck!

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[Crasher]

Be very wary of rebuilds, find someone who is ZF approved and who will also overhaul the converter. For a full job like that if you get quoted less than £3K, someone is wrong and that's plus labour...

[Chema.RB]

Yes I am inclined to agree as I have been doing some digging and I reckon the lock up on the tc may be gone. Is this likely to be the solenoid or the tc that needs replacing?

Second point is that I know of an a6 2.5 quattro in the scrap yard currently and was thinking of getting that box to overhaul and then just do a swap. Is the allroad box any different to the ordinary a6 ones? I will try and get the codes for the box from it later


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If you can drive a little more, there are an specialized Allroad breaker in Cricklade, they have a few gearboxes. I can give you their contact details if you are interested.

[mike ryan]

I Haven't been able to get back on here any sooner but here is an update. The fault code diagnosed the tc clutch not locking up. After a bit of digging I have found some training material for this gearbox on line. It all points towards the solenoid valves as that particular valve does the down shift for5-4. This has been banging for some time now so I reckon it is that. I am looking at overhauling or swapping out the valve body as this can be done whilst the box is in the car. The problem has not recurred since so I am taking it as an early warning.

On the plus side my mate has offered me his touraeg quite cheap. I think I will use that while mine is off the road and then make a profit on it later


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