UPDATE: All went well with the bushing replacement. The mechanic did mention a bit of modification and trimming was required to the bushings as the IPD kit is a wee bit different from the originals, however it only took about 15 additional minutes to correct. No big deal.

Though the ride hasn't changed, I do feel better knowing that I have refreshed the suspension. Next up, front suspension bushings! WEEEE!

Dakar09, you are exactly correct on the ease of "rebuilding" the 444/544 rear suspension. Paying attention to the few small details is the "toughest?" part of the process. James, you'll find that it is a "piece of cake".

I did this last year, it's about as easy as you can imagine. Spring decompression is unexciting and uneventful using a jack under the diff. There is A LOT of travel in the suspension, so get the car high off the ground to allow the axle to drop all the way down. If you're limiting straps are still there (doubtful) those need to come off first.

I didn't have to press anything out or anything in. There should be no need to take anything to a shop for that.

Keep a floor jack available for use under the control arms to raise or lower as needed for proper re-assembly.

Lastly, the torque rod setup was a bit of a bear to get back on. Take your time and have patience. Get it on the ground before you tighten those up.

Also, snug the shock bolts up but don't tighten them all the way until the car is weight-bearing and you bounce it up and down a few times. Then torque them down.

Results: I went poly bushings all over, new shocks and springs, and new hardware. It handles and rides phenomenally.
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Tony - 1958 Volvo PV444, 2012 Volvo XC70 T6 Polestar