89 900 transmission? - Saab 900 Bulletin Board - Saabnet.com
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89 900 transmission?
Posted by Jim (more from Jim) on Sat, 7 Apr 2001 08:35:23
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Car has 180k miles and I put Mobil 1 75ww 90 synthetic gear lube in and noticed after about 15 miles a humming noise from the front end. I don't know the type of oil that I removed but have had the car for 9k miles and it remained clean until I drained it. The noise sounds similar to the hum or howl that snow tires give off and is only affected by increase or a decrease in the speed of the car. It is not affected by the gear or neutral of the transmission. It is not affected by asphalt, concrete of gravel road or cornering. There is no vibration and appears to be directly linked to the revs of the wheel/axle. I'm going to put it on a lift later today and see if I can isolate the noise. I have had no previous transaxle problems. Last resort is inspect the oil. I'm not ready to blame the oil especially with no previous problems. Ideas greatly appreciated.
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