3 degree steel pinion angle shims

i think you are close,pinion should be -1.5 degrees to the ground,cass always told me set pinion opposite of trans and roll it down 2-3 degrees and your done
That’s why it is best to have ur tranny level first. Then adjust the pinion. If the trans is -1.5* then u want the pinion to be -4.5* or there abouts. Kim