I can cruise all day at 65mph in my Suburban.

It has a 261 and a 3.55 enclosed-driveshaft rear-end.
All front-end parts are original-style and well-adjusted.
No “wandering” at any speed.

It has the Suburban’s original-equipment front sway (anti-sway) bar.

People in the rear seat can easily talk to people in the front seat.