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Old 02-04-2012, 11:38 AM
RRPhil RRPhil is offline
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I’m sure the dealerships feel it’s more cost effective (for them) to just replace the whole transmission. It’s unlikely that any of their technicians will have been trained to do anything more than a TC or valve block swap on an automatic transmission anyway. The transmission’s running gear is not included in the BMW parts lists so they’d be unable to get spare parts through their usual system.

If the torque converter LUC problem was due to a weakness in the converter itself then I might recommend simply swapping it for a new/re-manufactured unit (which is exactly what happens with the ZF units). Unfortunately, as the failure stems from the hydraulic control system, the moment the TC is replaced the failure cycle will start over again because you haven’t cured the root cause.

Generally, therefore, if you’re having to replace the TC and the valve block and clean out all the running gear due to the metallic debris contamination, you might just as well fit a replacement transmission. If you’re going to do that, you might as well continue to run your transmission until it starts to drop into failsafe or refuses to engage Drive.

All of the above assumes, of course, that the metallic debris generation process is already underway in your transmission – so you really need to have the fluid checked before deciding what to do next.

Phil
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