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If your truck has shift on the fly system you can engage 4WD Hi at any speed below 50 mph.. Now to get into 4 low you need to come to a complete stop.. Shift into N with your foot on the brake...then select 4L
Lol is that what ur talkin bout cause if it is I have them they mount on the knuckles right
Yup...thats what your CVs attach to and the vacuum pressure causes your 4x4 to engage or disengage. The teeth inside or whats causing your grinding noise (most likely)