It was an NOS 23 spline Locker that I picked up at the Mopar Nat's about 30 years ago and just got around to installing it in the Dana 5 years ago when I built the Hemi for the car. I've owned the car for 40 years and it never acted like this before installing the locker. I might be exaggerating the lane change thing but it does dart side to side enough that steering correction is required to the point that I'm considering going back to the clutch style Power Lock but don't know how it will hold up to my 850 HP Hemi in a 4000LB car. Might try a spool since I need to get aftermarket axles anyway to be legal.
Get the Strange Engineering S Trac but you'll need 35 spline axles. Surprised that your 23 spline axles have held up to the abuse. The S Trac is much better behaved than a Detroit Locker and stronger than a clutch type. Probably about the only thing that meets your specs.
https://www.strangeengineering.net/product/dana-60-35-spline-strange-s-trac-3-series.html/
