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2021 GMC Sierra Denali CC 4WD Ultimate 6.2L
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Per GM Info......
Use of 4HI or 4LO and 4HI Lock or 4LO Lock on Full-time 4WD is intended for use on a low traction surface such as snow, ice, mud or sand. On a low traction surface, the differences in front and rear axle speeds will not have as much effect on binding because of the lower traction levels between the surface and the contact patch of the tires. On a high traction surface, the higher traction levels will create more binding and noise in the driveline.

PS - I have owned and driven 4wd GM trucks for over 40 yrs.
 
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