Good morning everyone.
I used 4 wheel Hi this morning on slick roadways, first time I think I've used it at speed for any duration and noticed a grinding or dragging noise from front end.
Neither wheel felt warm, I don't see any leak or sign of anything being loose.

Just had 3" leveling kit and some front end parts replaced recently.

Any ideas where to start? It did shift back out and unlock as it should.
Thanks for the bandwidth and any help or ideas.

 

Check the vacuum lines for the cad, make sure they are providing strong vacuum to the actuator on the front axle. This is a good resource for how things work.

Welcome to DF!