Be aware that even slight changes in the center bearing support height can cause vibrations at low speed. Volvo issued this TSB:

"Driveline Take-Off Vibration: Shimming May Be Required. From Volvo Technical Service Bulletin 45/102 Jan '91. [Symptom:] Take-off vibrations at low speed, especially with high acceleration and/or heavy load, can occur in some cases. [Solution:] The level of vibration can be reduced by changing the vertical position of the center support bearing. Best results differ from car to car. Start with a change of 6mm (1/4") upwards. If results are not acceptable, try positions from 5mm (3/16") downwards to 12mm (1/2") upwards from the original position. Note that clearance between drive shaft and fuel lines must be at least 20mm, and between drive shaft and the fuel tank at least 16mm. Shimming upwards should not exceed 12mm (1/2") and after re-positioning the center support bearing housing should not contact the floor pan."

In addition to what Most Unusual mentioned about the importance of preserving the driveshaft position relative to the yoke, it's also important to put the flange bolts back in the same holes. This is because Volvo, at the factory, sometimes used flange bolts of different lengths to get the overall balance right.

You should replace the set...the bearing and the support. I replaced both on my 1992 960 five years ago. Buy Volvo or other high-quality aftermarket parts ONLY...no Chinese bearings, for sure. Don't ask me how I know.

Removing and replacing the driveshaft is not difficult. But, if you do not have the capability to press bearings, you may want your local indy shop to do this step.

The new driveshaft bearing will need to be pressed into the new support housing. If the bearing does not go in exactly straight, you will have driveline vibration and noise. Then, this unit will need to be pressed onto the driveshaft. Using a hydraulic jack, a section of pipe and some chain, I was able to remove the old bearing. Using equipment from my workplace, I pressed the bearing onto the housing and then, the unit onto the driveshaft.

Step #1 - Use a yellow paint pen to mark the orientation of the individual driveline components. This is essential to eliminate vibration.

Check the rubber boot/bellows for cracks & tears. This is needed to keep dirt/debris from entering the splines.

You may also want to consider replacing the u-joints at this time. Check for excessive play/movement. The joint should move smoothly, but still be solid, with no slop.

After the support bearing has been pressed on, install the driveshaft using the alignment marks you placed on the components from step #1. Install the retaining screws, but do not tighten yet. Secure the CSB (center support bearing) to the transmission tunnel. Now tighten the retaining nuts to 25-30 ft-lbs.

Test drive for noise & vibration. If you do have vibration, the CSB can be loosened, shifted slightly and re-secured. Repeat until vibration stops.

Good luck,
Greg

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'01 V70 Wagon, 168K miles...'92 960 Wagon, 196K miles...'92 740 Turbo Wagon, 225K miles (sold)