I installed one of these Posi units in my Dart over the winter https://www.jegs.com/i/JEGS/555/62820/10002/-1.

Seems okay to drive but its noisy when turning. Even slight turns you can hear it.

Maybe it'll break in a bit and not be so bad but It creeps me out, I wish I had just gone with a spool now.

33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage