When I go over a small bump or any change in the road, I hear a small but incessant squeek. I can not locate the noise but i assume it is coming from the suspension.l David

2 possibilities if the body mount bolts are loose on the cab you will here a noise on the inside. if ball joints or a frame bushings are bad you will hear a squeak noise also

that is a strut, the rubber is squeeking, but if its making a bumping noise you need to replace the strut and rubbers, that will take care of your problem.

Mudflap hitting the ground?

Could be a ball joint, could be sway bar bushing. You need to check it out soon, a bad ball joint can cause the wheel to fall off. Typically a bad ball joint will squeek a little when you turn. Sway bar bushings are not so dangerous, they just make annoying noises over bumps.

sway bar end links are most noticeable when hitting small bumps in rapid sucession but a ball joint will squeek just sitting there pushing on the car, try to grease them they may go quiet for a while but will eventually need replaced

check bushings on the pan hard rod and or spring seats

The problem could be caused by a wheel bearing squeeling or the cv joint squeeling.

Grease!

If its a squeeking noise the rubber bushes on the shocks or the lower contol arm are worn out, if its a grinding noise it could be the shock itself. If it happens when you turn, a clucking noise might indicate a worn cv joint, or a worn wheel bearing. These are all things that need to be replaced by a professional mechanic, if you have the tools, the bushes might not be too hard to do yourself though. Hope this helps!

Ball joints, motor mounts, sway bar link rods? Hard to say without actually hearing the noise, but an experienced Volvo tech should be able to diagnose this pretty quick.