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Old 02-27-2020, 02:08 PM   #1
taylor84240harris
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Default Aw70 on the way out? Strange sound

My 91 240+t (only running 5psi) has developed a strange whistle/whine sound that starts around 40mph and increases in pitch to 60mph. It persists with the car off and in neutral coasting down the road. All I have done so far is check the trans fluid and make sure I don’t have any areas in the front end that might cause a whistle. Could the trans be on the way out? It shifts fine and dives like normal.
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Old 02-27-2020, 02:55 PM   #2
coalminer
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Could be the driveshaft carrier bearing that is failing.
Your car has a two piece driveshaft with a rubber mounted carrier bearing that supports the center section of the assembly.
It spins any time the rear wheels are turning.
Worth a look.

Hope this helps
Steve
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Old 02-27-2020, 04:42 PM   #3
IansPlatinum
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Could also be something in the rear axle.

You could possibly raise the rear axle up, see if it makes the noise, and if it does, mark the axle to flange alignment, and mark axle back half to front half alignment , unbolt the driveshaft flange from the rear axle, and carefully pull out the rear shaft from the front shaft, and then take the car up to that speed and see if the noise is still there. That will eliminate the axle from the equation. You could also disconnect the driveshaft flange from the transmission to eliminate both the axle and carrier bearing from the equation.

My aw70 is noisy in 1st gear FWIW
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Old 02-27-2020, 05:06 PM   #4
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I would bet that it's the driveshaft bearing.
I would also suggest that the AW70 under any boost whatsoever is on borrowed time.
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Old 02-27-2020, 10:22 PM   #5
ktm450
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Dudes,
Every 240 I have owned (5,auto and stick) have whistled and howled like a wounded animal. Especially when cold in winterMy 1992 wagon (stick) has about 3 different tones. The first time this happened to me (1987 245) I started calling around for a used transmission. I decided to just keep driving it, and put around 375000 miles on it and never did figure out what the noise was. My 1991 240 sedan auto does the same. I say just drive it if all feels tight with the drive shaft and bearing.
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Old 02-27-2020, 10:55 PM   #6
90volvo
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Mine used to make a squealing noise between 10-40 mph. I tried to chase it down but finally gave up and never had a problem. I’d say drive and enjoy it.
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Old 02-28-2020, 12:23 PM   #7
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Quote:
Originally Posted by 90volvo View Post
I’d say drive and enjoy it.
If that's your only symptom, yeah, but Kyote has a point about the aw70 + turbo

My trans is slipping in reverse when hot, so that plus the whine is enough to make me want to swap to an aw71...

You also gotta consider, what happens if the aw70 fails? Do you have a backup car? Will insurance cover towing? If the consequences of riding out the rest of the AW70's life aren't too bad, why not do it?
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Old 02-28-2020, 03:22 PM   #8
taylor84240harris
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Honestly if it fails I’m just gonna go with the T5 swap. I always over look the Obvious like the carrier bearing. I’ll check it out and re-post my findings this weekend thanks for the ideas!
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Old 02-28-2020, 05:05 PM   #9
2manyturbos
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90% chance it is the driveshaft center support bearing. They sound almost like a siren when they start to fail.
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Old 02-28-2020, 05:33 PM   #10
90volvo
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if it is I have a brand new one in the box with the rubber id part part with.
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Old 03-04-2020, 02:11 PM   #11
taylor84240harris
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Center support bearing was shot. Thanks for the info. I guess the trans will live another day
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