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Need Driveline Expert Opinions Please 900 1998

uid 11021's pic
posted by  dewfpo on  Sat Jul 12 13:11 CST 2008
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last visit: Thu Oct 23 18:34 CST 2014
[RELATED]

I am double posting this here and in the S90 Forum.

I need some expert advice, I am out of my field of expertise here. The vehicle is a 1998 Volvo S90 (964) with 81,543 miles with a driveline vibration.

- There is a clunk in driveline (felt and heard) when shifting from R to N or R to D
- At speeds above 55 mph the gearshift lever rocks forward & rearward (worse when the accelerator is pushed harder, less when off the accelerator).
- No unusual noises at that speed when the shaking is worst and the gearshift lever is rocking.
- Vibration can be felt in the accelerator pedal
- Vibration is not felt in the steering wheel
- Replaced both motor mounts – No Change
- Replaced auto trans crossmember mount - No Change
- Tires and wheels have been changed out – No Change
- Vehicle has an independent rear suspension with the rear differential rigidly mounted (via bushings). Can’t detect much play at that end by trying to move the driveshaft.
- Even with new mounts the trans tailshaft does have some movement in it but it doesn’t seem excessive.
- I can move the driveshaft at the center bushing but don’t know how much play is normal. I’ve never had a car with a 2 piece driveshaft and center bushing before so I don’t know how to diagnose it other than what I have already done. The more miles I put on this the worse it seems to be getting.

Please advise.

Thanks in Advance, DEWFPO
--
1998 S90 077,400 and 1995 964 154,100






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