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Old 08-18-2011, 07:26 PM   #1
dok33
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Default AW71 Tailshaft bushing issues

I just replaced the tailshaft bushing in my '88 240 (has an aw71 swapped in) because it was leaking and I was getting a howling/grinding noise on decel or when coasting in neutral. Unfortunately while it did fix the leak I'm still getting the noise. There is still also some play in the tailshaft, any ideas on this?

The only thing I can think of is that the tailshaft housing is fubared. I have the old AW70 and the output on it is nice and tight so I may just swap over the housing and flange and see what that does, was just hoping to get some other opinions before I exert the effort to pull the housing again...
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Old 08-18-2011, 07:30 PM   #2
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Maybe the noise is coming from the driveshaft or the rear end.
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Old 08-18-2011, 07:37 PM   #3
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could be coming from the back of the trans too. swapping the housing from the 70 will either confirm or deny this. might want to replace the bushing and seal before installing it.
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Old 08-18-2011, 07:39 PM   #4
dok33
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Thanks for the quick reply!

I checked all of the ujoints, no play in the center support or pinion and I changed the diff fluid and it looked ok but I guess a wheel bearing or carrier/pinion bearing could be going. The thing that's pointing me to the tailshaft bushing/housing is that it still has some play in it even with the new bushing and the old trans has none at all...
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Old 08-18-2011, 09:27 PM   #5
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Another though, I noticed when i swapped the trans that there were ~3/8" spacers between the trans crossmember and frame. I replaced all of the mounts and am wondering if those were possibly put in to correct some driveline vibration due to bad mounts by the previous owner and might be causing the issue I'm having now. It's been a while since I had a 240 but I don't remember seeing something like that before...
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Old 08-18-2011, 09:48 PM   #6
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some 240's have them, some don't. It's probably more of a driveshaft initial angle thing than compensation for worn mounts.
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Old 08-19-2011, 01:46 AM   #7
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Put the rear axel up on jack stands. Start it up, put it in gear and try to reproduce the noise. If you can, get someone to listen outside the car and try to locate the source.
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Old 08-21-2011, 01:32 PM   #8
dok33
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Ended up being the output flange, had a worn section on it that allowed it to bounce around and tear up the new bushing. I swapped the output flange and housing from the AW70 and it's all good now. Thanks for all the input!
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Old 08-24-2011, 02:12 AM   #9
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I think rockauto has a replacement sleve for a worn out tail bushing ? save all used parts/ never thow away any thing ask me how I know
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Old 08-26-2011, 07:33 PM   #10
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I had a issue with worn rear control arm bushing bad causing the pinion angle to change on my lowered 87 240. Bushing are also bad on my 91 that is not lowered and I hear the same noise, just have not had time to change them.
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