I think Kane is right on when he says ball joints, tie rod ends, or tie rods. After going through all this on my 83, I found the steering gear can be adjusted. You take off a cover plate, remove a nut that holds a "tabbed" washer with 8? tabs, bend down the tab that is up and bend up the tab on one side or the other (trial and error), reinstall, test drive, and repeat if necessary. Apparently, this balances the power steering fuild pressure on each side of the steering gear. I know on 83's there were two types of steering gears used by Volvo and only one type had the above adjustment. It could easily be you just got a bad alignment job too!