Well I went out and looked at it this evening, And there'* no doubt it'* coming from the trans.
When it popped it rolled a little again like it'* coming out of park for a split second. It doesn't roll every time it pops,and it doesn't pop every time. just every once in a while.And when I put it in neutral and rev it a little the speedometer goes up then it pops lightly but it does it real loud in park. The speedo thing I never noticed before, But there'* no doubt it'* all related. It'* like somethings catching inside the tranny when it comes back down from a slight rev.