I am installing a 4-link frame with coil-over and a narrowed Ford 9" rearend. I noticed the OEM Ford 9" pinion is offset from center. My transmission and driveshaft is on center. I believe the 9" came out of a Ford 1/2 ton truck so was the entire driveline in the truck off center ? When I narrow the rearend, I plan to narrow it with pinion on center. Is this the correct way to go or am I missing something important ?