Back tires rotate at different speeds

2010 DCSB V6

I replaced my U-joints and the center support bearing yesterday. While I had the truck in neutral to rotate the driveshaft, I happened to notice my rear tires were not rotating at the same rate. The driver's side rotates at what appears normal (if I turn the shaft, the wheel turns). The passenger's side rotates at what I would estimate is 50-70% of that. When I turn the shaft, it almost seems to "skip" every so often. It's enough to be visibly different from the driver's side.

Any ideas? Could it be the rear diff or something in the wheel assembly? I did not notice any noise. I can provide a video if needed.

Thanks in advance!

 

That's just the differential doing its job.

https://www.youtube.com/watch?v=yYAw79386WI

 

I understand the differential (better now thanks to that video). But wouldn't this mean that one tire is encountering resistance? Both tires were off the ground, so I would think they would spin freely at the same rate, no? Or is the resistance tolerance so low that even a slight amount causes the slip?

 

In the air even a tiny difference in resistance left to right would be enough to see different results left to right. That difference is negligible on the ground.

Jeff

 

Thank you for the quick responses!