Does anyone know how the 6l90 compares to the 4l80e as far as ease of swapping? I think I can control the 6l90 w/ the PCM that I got w/ my motor. I've read that the 6l90 is a little shorter than the 4l60e so clearances shouldn't be an issue. Does $1300 seem like a decent price for 7k mile 6l90 w/o tcase?