I had a buddy call and ask if 700r4's have similar issues to 400's with killing engine thrust. My initial answer was no, but I don't do too much with 700r's or 4L60's so I thought I'd throw this out there. He is swapping an engine in a car for a customer (bigger power) and noticed the fairly fresh GM performance 383 has .045 crank thrust. I told him I doubt it's converter related but I'd dig a little. I didn't build the trans so I can't answer what's done to it, or what converter it is. Thanks.