Originally Posted by
Hall
.... Leaning to transfer case gear noise. The transfer case is the more common culprit. ....
Sounds very similar to my issue about a year ago.
Same thing happened to me.
On a night drive after work, just for the hell of it.
About 100klms from home, transfer popped out of high range(ie. no drive) and coasted to a stop.
after head scratching I found that the lever was in neutral, back into high and the screaming gear noise started then and there.
Tried low range for a short distance, and similar whiny noise, but that's normal in low range anyhow!
Drove home carefully, no T/C leaks, so no loss of oil, checked again a few klms later .. and again, and again .. stayed off the freeway to sit safely at about 60-ish km/h and so on.
Next day I went to top up T/C with a bit more oil, just in case, but it was already brimming.
organised a change over T/C drive for ages to get said changeover done and noise gone
Can't remember which bearing they said stuffed up, but they said it was a bearing.
The one thing to test out too, when it starts making the whiny noise, find a flat or slightly downhill stretch of road and use the throttle to see if you can eliminate the noise.
On mine, if I had the throttle at just the right spot .. not full trailing, just a slight amount of overrun, the bearing screaming could be completely eliminated.
On a full trailing throttle mine would still whine, but much less volume.
Mine started to make a ever so very slight whiny noise just prior to the high range pop out that one night, when it went pop. Very very slight, and having an RRC for many years, many years ago .. that thing was excessively loud in the transmission anyhow, so was somethign I was used too.
Thought nothing of the very slight whiny noise building up.
Then came that pop that night and the very slight whine became painful .. and $$$$!!!
After my 'pop night', the noise started at about 40-ish, got loud at 60-ish and got painful at over 80km/h.
The problem with the sound recording, is that we can't get a reference point of how loud it really is.
But it sounds almost as loud as the 300 Tdi engine noise/drone.
What speed was the recording done?
Can't say for sure, but given the level of the engine sound and the whine noise being similar, I'd say it's as loud as mine was after my T/C's popping episode.
My 300 Tdi is also an auto.
After the TC reco was done, driving home was surreal in that it was exceptionally quiet.(and still is now).
Try the trailing throttle test too. it's a very small and specific position of the throttle that matches the engine load with that already on the transmission.
And I just can't remember which bearing they said was the culprit on mine too ... sorry.
Arthur.
'99 D1 300Tdi Auto
'03 D2 Td5 Auto
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