Quote:
Originally Posted by jissparks
I have a 99 ML320 with 110K miles that has generally given good service. About 2 weeks ago it developed what I can best describe as an intermittent high-pitched whistling sound from the drivetrain. I've poked around a bit and cannot see anything obvious. It's hard to locate the noise exactly, and you cannot hear it as a pedestrian when the car passes. The noise starts only after the car warms up, it is definitely related to vehicle speed rather than engine speed, and is unaffected by applying the brakes. The noise starts at about 35MPH. Initially I made it go away my driving a bit in lowrange, but that now has no effect. It sounds like a bearing, but where?
Thoughts?
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Have you ever changed the transfer case fluid? I have read many threads about noise from the transfer case being done away with by changing the fluid in the transfer case. Sometimes changing it several times in short intervals is necessay. According to some MB Techs, the transfer case fluid should be changed around every 50 to 60,000 miles. My 2 cents.