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Transmission noise or clutch noise? 200

posted by  someone claiming to be Dan Connors on  Mon Mar 26 21:19 CST 2018 [RELATED]

1983 245, 376,000 miles and change. Original B23F and M46.

I had a new clutch put in about 3 years and 15,000 miles ago. The mechanic who did the work is a well respected Volvo specialist who has worked on my car for over 20 years, and he used OE parts (Sachs). The pilot and throw-out bearings were replaced, the flywheel was resurfaced, he replaced the rear main seal and the transmission mount.

About a month ago, the car started making a horrible noise. It sounds like a bearing going south. The pitch increases/decreases with the speed of the transmission. For example, if I accelerated up to 45 mph in 4th gear, then push in the clutch and downshift into 3rd, the whine increases dramatically in pitch and volume, even though the car is coasting (engine rpm at idle). Shift back into 4th, without letting the clutch out, and it quiets down considerably.

There is also a "rushing" sound (like running water) when the car is stationary and the clutch is engaged. If I push the clutch to the floor, the sound stops.

How do I tell the difference between a bad T/O bearing and internal transmission problems?






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