I got the info from Eric:
"they're 4.27 r&ps... the rear is
centered, axles are D30 and D44 from '73 CJ5."
That's the stock ratio for Jeep with the v8/3-sp combo back then. Friend had one 10 yrs ago.
So he running 1.6l, 5-sp or auto (?), Sami 6:1 t-case, running 4.27's on what looks like 35x15.50 Swampers?
Is it a daily driver? What is his rpm at highway speeds?
On his front suspension, he has the centered tri-link from the pics on ZOA's website. Does he have a track arm, couldn't see one? I wonder how much it wonders on the road at speed. The track arm is what locates the axle side to side under the truck. With the pitman arm pushing/pulling on the drag link to the passenger knuckle, there has to be something like the track arm to resist that push/pull effect.