Read diff going or other?

Kiwi79

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Just got 4 new PS4 tyres all around and suddenly i'm getting this whirring/whining sound when off accelerator, as soon as I put load on the engine it goes. Most noticeable if accelerate to 35mph and then step of the accelerator and coast down. I've had 4 wheel alignment done and so i'm unsure why this has flared up suddenly.

Is it likely to be rear diff and if so why is is happening? Sawtooth? I remember when i had just 2 new front with different tyres on back it sounded kind of similar.
 
when my diff went it started to "sing" at about 55mph stopped at 50mph and 60mph
Yours sounds more like a wheel bearing