Help me diagnose this sound

[Pir0San]

I recently replaced my rear end with another r180, and now I am hearing a weird click noise coming from what seems to me to be the right rear tire area. I don't believe it to be a u-joint or differential mount problem because when I did the swap, I replaced the differential mount, and used the halfshafts that came with the new r180 differential. I jacked the car up, and tried to see if there was any slop in the halfshaft u-joints, and I didn't notice any. I made sure everything was bolted snugly, so I really have no idea what the sound could be.

I have a feeling that it could be bad wheel bearings on the right side. When I had the car on jackstands and I was replacing the differential, I had spun both the right and left wheels while the halfshafts were off, and it seemed like the left one would do twenty rotations whereas the right one would do maybe two or three. Could this be a bearing problem?

I was also thinking it could have been a differential problem, but I'm hoping it's not. When I pulled the differential, I drained the gear oil out of it, and it seemed to be less than desired. I did check the drain plug for metal shavings, and the gear teeth for chipping, and no problems were found. Could the bearings on the differential be going bad?

[Mr Camouflage]

http://www.classiczcars.com/forums/showthread.php?t=26154