Disco 3/4 Automatic Transmission FAQ - 6 Speed

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Originally Posted by Russrobe

Yep, at first the vibration was very mild but as we approached 7000kms of owning it, at times i'd say moderate vibration. Always through the body, never felt through the steering wheel.

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Hmmm drove up some of the steep side streets in Lorne today, first gear high range about 15 to 20 kph and could feel some very harsh vibrations pulsing in and out... interesting test actually.

Mmm, doesn't sound right. Have you cleared the trans settings? It could be relearning.

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Originally Posted by Stuart02

I've noticed lately that on steady 60 or 70 kph hills, the revs oscillate between 1200 and 1400 rpm. Is that a bad sign? Will Dr Tranny get some extra life out of the old bloke?

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Short answer is torque converter lockup clutch is the culprit. Depending on kms on the box a new converter alone may sort it.
Dr tranny may lessen the symptoms however masking them is only postponing the inevitable.
I have replaced only the torque converters in these successfully in the past.

Jc

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Originally Posted by justinc

Short answer is torque converter lockup clutch is the culprit. Depending on kms on the box a new converter alone may sort it.
Dr tranny may lessen the symptoms however masking them is only postponing the inevitable.
I have replaced only the torque converters in these successfully in the past.

Jc

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Thanks, that's a glimmer of hope!

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Originally Posted by rar110

Mmm, doesn't sound right. Have you cleared the trans settings? It could be relearning.

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I've done a hard reset on the car recently, nothing trans specific...

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Originally Posted by justinc

Short answer is torque converter lockup clutch is the culprit. Depending on kms on the box a new converter alone may sort it.
Dr tranny may lessen the symptoms however masking them is only postponing the inevitable.
I have replaced only the torque converters in these successfully in the past.

Jc

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If the torque converter is the issue, is there a chance of catastrophic failure or can I just put up with it until it gets really annoying/I have the money spare to deal with it?

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Originally Posted by Stuart02

If the torque converter is the issue, is there a chance of catastrophic failure or can I just put up with it until it gets really annoying/I have the money spare to deal with it?

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Sooner is best. The lockup clutch material is already blocking up the filter and causing low line pressures and eventually it will disappear altogether and then metal fragments from the clutch surfaces will spell the end of the transmission.

Jc

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Originally Posted by justinc

Sooner is best. The lockup clutch material is already blocking up the filter and causing low line pressures and eventually it will disappear altogether and then metal fragments from the clutch surfaces will spell the end of the transmission.

Jc

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Thanks, I'll get on it... :/

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Originally Posted by justinc

Sooner is best. The lockup clutch material is already blocking up the filter and causing low line pressures and eventually it will disappear altogether and then metal fragments from the clutch surfaces will spell the end of the transmission.

Jc

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Exactly what my transmission specialist told me.

Unfortunately when they checked the filter there was metal in it so a full rebuild was required. (this was my previous D3)

I now get the transmission serviced every 40K. If it starts to shudder I will get the torque converter done immediately. Hopefully with the transmission being serviced regularly the stator bush doesn't raise it's head.

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Originally Posted by Geedublya

Exactly what my transmission specialist told me.

Unfortunately when they checked the filter there was metal in it so a full rebuild was required. (this was my previous D3)

I now get the transmission serviced every 40K. If it starts to shudder I will get the torque converter done immediately. Hopefully with the transmission being serviced regularly the stator bush doesn't raise it's head.

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Does $1300 to replace the torque converter sound in the ball park?