My S60 in the Duster is 198lb with strange calipers/rotors.

The gear swap deal... I have my 4.30 gear on a separate spool so a gear change can actually be done in a timely manner as it has its own shim pack & the S60 has side adjusters so that takes a lot of “grief” away from set up over a D60.

We went with the Dana style as it was a somewhat affordable “set it & forget it” rear for when my dad had the car. From a weight and gear selection standpoint, I think I would have gone with a fabbed 9” based deal. Or 8.75+.25 for you Mopar purists