Hopefully in a couple months I can report back with some results with my 3.23's in my Duster. I didn't care for the 3.55's on the highway but the 3.23's are livable. I'm around 2600 on the highway with a 27.5" tall tire.

1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual