Greetings, Brickboarders!

I recently had the ball joints, tie rod ends, sway bay link ends and bushings, and strut rods replaced in my 1989 Volvo 760 Ti with IRS. I also had new u-joints, center bearing carrier and bearing installed along with a new pinion seal. Oh, and also a new tranny mount and hydraulic engine mounts, which were totally flat and useless! The car is much quieter as far as elimination of low speed driveline rumble, which usually went away by 10 mph, and was very evident going up steep hills at slow speeds. The engine actually seems to start up quicker and is quieter unless you consider the ticking, which I have yet to diagnose. The shuddering I had when braking from high speeds has totally disappeared and the car feels more secure now, by all measures. I think the strut rods were causing that problem, as they were paper-thin upon inspection after removal.

The problem I have now is a kind of strange fluttering or drumming coming from the front suspension when driving over rough pavement/rocky roads. I live in Turkey, and there are lots of rough/rocky roads around. It sounds like something is loose, and the thumping doesn't occur at highway speeds, only at slow speeds. Is there something that the shop could have done wrong to make this happen, or are there additional parts I should think about changing? Could it be that they didn't torque the bolts enough when they put in the new items? Also, at about 65-70 miles an hour there is a harmonic, cyclical drone coming from the rear of the car, which intensifies when I let off the gas. It's not terrible, but I'm worried it is a sign of impending doom. Being stranded on the roadside in Turkey is not something I relish. Should I be concerned? The shop said they couldn't use the U-joints that I purchased after I measured the yokes on the existing u-joints and got new ones from FCPgroton.com (Thanks again, Nick!) so they installed some that they were able to get from Ford. Could this be a problem or are u-joints fairly non-specific? I mean, a 3" u-joint of the same bearing size and joint length is going to fit regardless of source, or not? The shop also told me they balanced the driveshaft, but I wonder if it matters if they only balanced the rear half and not the whole, articulated mess together. I wish I had access to a garage and some hand tools and I would just do it all myself, but that's NOT an option in a concrete and asphalt jungle like Izmir...

These problems are not life-threatening or that huge, but I figured after I installed new parts, the driveshaft would be whisper quiet and the front end would be knock-free. Any ideas on what needs to happen to correct these issues, or should I just live with my slightly-less noisy brick and be happy? Thanks in advance for any ideas. Have fun Brickin' and be safe...