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240 driveline shudder[ALL/1998] posted by jack on
Wednesday, 22 October 1997, at 3:24 p.m.
While we are talking about driveshaft vibration........
Both of my '81 240's have a pronounced shudder on acceleration (only).
The more heavily loaded the cars are, the more pronounced the vibration.
This is low speed only and only on acceleration.
I've changed the carrier bearing supports and trans. mounts and checked motor mounts (both cars). U-joints are OK also. I have heard that this is not uncommon and that earlier carrier bearing supports were firmer and may help.
Experience/advice/sympathy?
Re: 240 driveline shudder[ALL/1998] posted by Abe Crombie on
Wednesday, 22 October 1997, at 5:41 p.m.
When you take off the front of your axle housing tilts up in response to the
toeque trying to rotate the wheels. The angularity of the rear u-joint causes a
a rotational speed difference that makes the front of the axle housing wobble
up and down as the speed and thus the torque vary. Anything that allows the axle to move more than Volvo intended will make your take off vibes worse. Extra load causes extra torque to be needed to move car and extra load on bushings and extra rotation of axle housing and thus extra vibration.
So, what does all this mean?
Look at all your rear axle bushings, especially the ones below the axle housing on each "trailing arm". If these are not good your axle motion will be more and vibes will increase. Faulty rear u-joint will cause increased vibes.
Worn tail housing bushing on auto trans models will add to this effect.
The vibration is more or less harmless, so spend until the drain on your bank account becomes worse than the aggravation of the vibration.