I had the car off the ground last night changing the oil and rotating the tires. While it was up, I thought I'd track a squeak coming from the driver side rear brake when applying light brake pressure at low speed. I never found the source of the squeak, but I did see that the driver side axle almost looks bent. I took a little comparison video and posted a link below. It almost looks like the u-joint is misaligned inside the boot.

Note: Car is idling in 1st gear. I don't feel any vibration in the car when driving, and I tugged around on the axle and it feels solid.

 

that does look bent or off center.
The question is what's causing it?
Is it a broken U joint or a bad bearing?
If the bearing is damaged and spins axle off center, I believe you will get similar results since the other side of the axle is held inside the bearing.
I would blame the bearing first as it's a more common thing to go wrong. Check for any slack or noise in the bearing.

 

When you say bearing, you mean the one in the hub or the one inside the differential? Both ends (wheel and diff.) are tight with no play.

I didn't think of it, but I should have pulled out my stethoscope and listened to the bearings. May do that tomorrow or this weekend.

EDIT: The passenger side appears to have very little movement. Maybe it is within the acceptable run out limit. Might be time to pick up a dial indicator with a magnetic stand.

 

the one in the hub.