Because weight is a concern? A 4l80e will hold twice as much as that glide right out of the box. Your only saving grace is going to be your race weight, even then I think that glide is going to bite it the first time the s475 spools. It costs several thousand dollars to make a glide hold what this swap will make… I hate to see you do it twice. You’ll need a ~5k stall converter and you’ll have a whole 1500RPMS of powerband, believe me I’d love to see this work but it just doesn’t add up.