i am restoring a 77 chevy grumman step van. it has 8 lug drums all 4 corners, i am wanting to convert to disc on the front. i understand the p20 is based on a same year c20 3/4 ton long bed frame, is this correct? it has IFS and looks same as parts on those era trucks, but i was told today that the ball joint angles may be different, or have a different taper on the shaft...... i cant see that minor of a difference on stock parts, but dont know enough to know so i am asking for any info you guys may have on these set ups i found disc spindles, but am afraid to go drop the money on them if they wont work (salvage yard, so no refunds) ---------- Post added at 10:40 PM ---------- Previous post was at 10:39 PM ---------- was there a separate commercial frame, or a motor home frame these vans were built on? would these parts be different from a same year span c20 or suburban?.... i remember someone over the weekend mentioning a camper special........ were the geometries really different on all these?