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Sounds like the pinon seal and bushing need replaced at the tranny.
Check the bushing at the tranny by grabbing the driveshaft about 12 inches from the tranny and pushing it up and down . If it moves 1/4 - 1/2 inch or more at the tranny you will need a bushing and seal at the tranny end.
Also you may need a U Joint [($10) at Auto parts store]there are 3 of them. They are easy to check drop the drive shaft and check the movement at the joints. If there is no binding when you bend the drive shaft at the joints then they are still good. And yes it can be expensive to replace everything. I did everything from the tranny back to differental it was $600 for all new parts and labor including centerbearing and all 3 Ujoints. By the way that was at a Volvo Dealer. Local garage would probably do it under $400.
I did the whole driveshaft because since they had to tear the whole driveshaft apart anyway. Why not do it all and never have to do it again. I figured since the seal and bushing at the tranny was bad as well as one of the U-Joints it wouldn't be long before another U-Joint or the center bearing went.
Plus the car has 233,000 miles, 372K kilometers on it.
If you plan on keeping the car for sometime I'd do the whole thing due to the age and miles. But if your only going to keep it for another year or two just fix what needs fixed.
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