should i replace the rear driveshafts?

I have a 96 legacy sedan. I ended up with inheriting a problem with the awd system. It was driven with the wrong size tires for I dont know how long. It now makes a clunk noise in the rear when in reverse and taking turns. I have replaced both front driveaxles and had one of the front bearings replaced. I have changed all the tires to the correct size. The tires are new. I am still experiencing the clunk noise when in reverse or taking turns. I am currently running the car in fwd and not having any problems. Should I replace the rear driveshafts as well?