transmission drain and fill

I'd done a drain and fill in my 07 V8 4wd 4runner and I go for a drive and under medium acceleration through first second and third there is some sort of noise that I can only describe as similar to a heat shield rattle (and a wine from behind the motor at idle, sometimes more prominent...

I have everything I need for my first (and the cruiser’s) transmission drain and fill. But, my local Toyota shop mailed the crush washers via usps and it appears they got lost. So my question is… how important are the crush washers? 🫢 I’m thinking I do the job with the old crush washers and...