Ron,
I am not sure the contents of my message will help you much resolving the issue
you have with your 850, but it might bring some new perspectives towards accomplishing the repair of your vehicle.

I do own a '95 850. Bought it brand new. NEVER, EVER had any handling problems
until 3 months ago. Last year I even had a Volvo dealer replace all shocks,
struts and springs. All brand new to make sure that the suspension would be within manufacturer's specs.

Three months ago I bought a set of brand new tires (4). For a few weeks, the
front pulled, as usually occurs when you mount new tires and after a couple of
thousand miles the car was back to its normal and steady handling.

Three months ago I took the 850 for the 100,000 maintenaince service (same Volvo
dealer) and I was talked into doing a wheel alignment. I had brand new tires on
and last year they had replaced the whole suspension. Why not, right?

I want you to remember that my car was fine when it went in that morning. Even
after replacing the whole suspension system and having new tires on.

When I picked it up in the afternoon, on my drive home, the car pulled to the left; badly. Needless to say I was back at the dealer's the next morning. They had given me a copy of the alignment readings and when they re-did the
alignment the following day, I compared them. Totally different than the
previous one. Now the car pulled to the right and had too much, what's known as, "rear axle steering".

Three days later, I took my car to a different Volvo dealer. The alignment
readings? Different than the previous two. And yet the car had too much pull,
this time to both sides.

This dealer told me three stupid things:
* You hit something hard and bent a suspension part...
* Since your car is kind of old, the steering system makes the car pull...
* Your car alignment readings are within manufacturer's specs (go figure!)...

I did not give up and took the car to a third Volvo dealer. A new 4 wheel
alignment was done and I received another chart with different readings. I still have all these for any body to see and believe.

What this long story might tell you is that you could have a mis-alingned car
(like I still do) and, if that's the case, the hard part will be to find somebody that will fix it for you. I haven't. My car still pulls. Mine pulls
to both sides because of a simple fact: the rear wheels have too much toe in
(they look like a crosseyed individual) and they "steer" the car to the right;
and when you correct that, they steer it to the left. Remember, the front wheels turn, but the rear steer in ways many people don't know.

The interesting part is that the Dealer's computer shows these specs as to be
accurate. But they all did anyway. According to the Dealer's that is.

And something I learned in the past three months in one of these internet forums: a 4-wheel-alignment, when it's done right, it does not take less than
1hr and 30minutes to completed thoroughly and the alignment MUST start with the REAR wheels first and once these are perfectly parallel to the structure of the
car, then, the mechanic perfoms the alignment on the front. 99.99% of dealers
do totally the opposite.

I hope this helps you fix your car.
Albert