[LongBox]

Whaddya mean by "a slight consideration?" What is the final drive ratio in your truck? If it is 3.73 or lower (hhigher number), you might very well need the OD geqr that you get in a 700R4. The 700R4 can be "built" to take the torque of the 454. If you go that route, everything will bolt right back up when you are finished. If you want the heft of the TH400, and the OD gear, you need some sort of 4L80 trans, but they have electronics, and I'm not sure how they would adapt to our trucks. Maybe someone else will chime in.