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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)
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