[Jared at Pelican Parts]

Some things to check,

- Shock mounts, It's possible that one or both upper shock mounts are worn out. Essentially, it is a small piece of rubber that suports the top of the shock in the rear, and it's pretty common for these to wear out, causing the occasional knocking sound.

- Driveshaft Flex disc, This too, is another piece of rubber that connects the driveshaft to the transmission. It is desgined to work as both a vibration damper and and a coupling. When they fail, it causes a knocking sound during acceleration.

- Differential carrier bearings, a long shot, but you mentioned it makes the noise during right hand turns. If the bearings in the diff are shot, it can whine or knock during turns.