896 Knocking noise from rear quarter passenger side

[Padawan]

I have the same exact issue, and have not yet been able to determine what is causing the noise. Please keep me updated.

[stcroixdrew]

I have a 98 Box w/ 55000 miles...I had the exact same sound..BUT it would move now and then from side to side..weird. It turned out it was my front engine mount...swapped it out and all was better and my car felt tighter and new again. Unfortunately..you have to remove it to check it out. I got a great deal at Sunset Imports in Oregon for the part. Its a pretty simple DIY project...I belive I did it on ramps in about an hour.

[Tony Roma]

Could also be this DIY - Replace Rear Upper Control Arms (Track Arms)