What causes a roar in the rear of the van except the tires already checked that.and I sounds like the rear end went out but it's front wheel drive

What is your question?

When going down the road sounds like the rear end went out but it's front wheel drive and I've already replaced by the tires

What makes this problem better or worse?

Higher speeds and at low speeds there's like a sound of a bad tire

How long has your 2009 Nissan Quest had this problem?

About a month