My car is a '98 V70 AWD. The AWD system is still functional.

After sitting most of the winter the car has developed a new noise. When I back out of my driveway and turn the steering all the way to full lock I hear a thunk/clunk that continues as long as the car keeps moving. It seems worse if the steering wheel is cranked all the way to the right.

The noise does not occur when the car is stationary or moving forward at full lock. It just occurs when I'm moving in reverse at full lock. My impression is the sound is moving more from the right side of the car.

I had the front passenger side wheel off but didn't find anything clearly loose. The boots on the CV are intact and there are no signs of grease being slung.

The car had the rear calipers replaced before going to sleep for the winter. In the prior year all four tires were replaced. In the last 3-4 years the front strut assemblies were replaced the Sachs units, rear Boge shocks were replaced, all the sway bar end links were replaced. It had an alignment at the dealer and still holds it.

I greased the steering stops with generic grease but it made no difference.

I did figured out today that the shop that replaced both calipers over torqued the lug nuts. I can't really find anything else that's off.

The car drives fine. There's no strange noises when driving over the terrible IL roads. No clunks or creaking noises. I have no clue what's up with it. Any ideas? Thanks.