Driveline angle should be between 1 and 4 degrees down to the back, with 3 being typical, really a function that effects the location of the rear end as well and inherently the pinion angle as well.I'm trying to figure the angle that my 427 needs to tilt back towards the rear of my 66 elco. I'm fabbing a crossmember for the th400, and I'm using solid motor mounts. Should it sit level or lean back a couple degrees?? Thanks!!!!