240 creaking from rear of car

'89 240 dl
For a while I've had a sort of creaking sound coming from the rear passenger side wheel well area of my car. It's most noticeable when driving really slow over even mildly uneven surfaces. The rear shocks are only a year old and installed correctl/torqued correctly. The torque rod bushings were recently replaced. I'm thinking that it could be trailing rod bushings, but I thought that I would hear a "clunk in the trunk" if it were, which is not happening. It definitely seems like a suspension related issue though.

Anyone have thoughts on what it could be?

Rear control arm bushings. The ones on the diff. Changing them is not fun.