Rear axle out of balance?

I have a 2016 Tundra SR5 4x4 that I purchased new, and she has been maintained well. She now has 120000 miles on it.
I notice when I start driving in first thing the rear end seems like it is out of balance, after about a half of mile of driving it clears up and is fine until the next day travels 15 miles one way to work each day. The E brake cable was hanging up and now fixed. Problem happens warm or cold, any ideas?

 

What does out of balance mean? Shake? Noise? Doesn't drive straight?

 

Sounds like flat spots on tires after it sits overnight. They come out once the tires warm up.

Do you have E rated, 10 ply tires? They’re much worse about flat spotting overnight than a passenger tire.

 

I just put on new 10 ply General snow tires it did it with my summer tires as well. My mechanic can’t find anything mechanical wrong.
Alignment just done when the tires were put on.
It actually feels like a wheel out of balance,

 

Bent wheel?

 

Can you feel it in the seat, vibration ??

 

No seat vibration just feels like a wheel out of balance and then stops completely after a half mile of driving and it’s only 1st thing in the morning

 

What psi are your tires

 

I’m running 35 psi.

 

Any guesses anyone!!!!

 

Swap your front tires for the rears and see if the problem persists, or if the problem shifts to the front?

 

Very good I will attempt this next

 

I get this too but just assumed it was the tires. Never spent too much time worrying more about it.

 

That is exactly what it is. Some tires will take a set overnight and you feel that flat spot on every rotation for a couple miles. Nothing to be concerned with.

i had a bmw once with soft summer tires. It did this every drive that sat more than 12 hours.