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> Volvo 240 Transmission Knocking Noise
Cuffman
post Jan 7 2017, 07:28 PM
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I have a 1991 Volvo 240 with the 4cyl. and automatic transmission. Awhile ago it started making a clunky knocking sound around the transmission. It happens only at low speeds when switching from drive to coasting. At high speeds it goes away. Before this started, I changed the motor and transmission mounts which were bad. I thought it may have been the u joints so I changed all 3 and the problem seemed to be fixed. However when backing up an incline it started again and continued for a few days. It went completely away again after driving it for a while. It is dependent on engine speed and not suspension related. When it is making the noise it happens below 30mph and also when turning the engine on and off. When changing the u joints I didn't see any signs of anything hitting on the underside. I would like to put some money into this car as it needs some work, but if the transmission is about to fail, I don't want to waste the money. The car has about 220,000 on it.
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danielm85948
post Jan 8 2017, 09:15 AM
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QUOTE (Cuffman @ Jan 7 2017, 07:28 PM)
I have a 1991 Volvo 240 with the 4cyl. and automatic transmission. Awhile ago it started making a clunky knocking sound around the transmission. It happens only at low speeds when switching from drive to coasting. At high speeds it goes away. Before this started, I changed the motor and transmission mounts which were bad. I thought it may have been the u joints so I changed all 3 and the problem seemed to be fixed. However when backing up an incline it started again and continued for a few days. It went completely away again after driving it for a while. It is dependent on engine speed and not suspension related. When it is making the noise it happens below 30mph and also when turning the engine on and off. When changing the u joints I didn't see any signs of anything hitting on the underside. I would like to put some money into this car as it needs some work, but if the transmission is about to fail, I don't want to waste the money. The car has about 220,000 on it.

check the joints on your prop shaft.
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Cuffman
post Jan 15 2017, 02:20 PM
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QUOTE (danielm85948 @ Jan 8 2017, 09:15 AM)
check the joints on your prop shaft.


The u joints? I already changed all the u joints on the prop shaft.
I considered the bearing that is on the prop shaft halfway down, but it makes the noise on startup and shutting off as well. This bearing wouldn't be moving at this time.
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