Outer Limits 4x4 Board

just had the airlocker installed in the front and driving home on the black top in 2 wheel and hubs locked not diff and at 80 ks + it get a droning noise with a slight vibration. 31 at tyres 5" lift with correct castor angles
unlock the hubs no noise or vibrations
Is this normal

pinion bearing or uni's

the diff was recoed when the air locker went in but i hadn't driven it with the hubs locked on the road