2005 Chevrolet Silverado 1500 Q&A

2005 Chevrolet Silverado 1500 Question: my suburban while driving will come out of 2wd

my suburban will be in 2wd and moving let off the gas and it will slip out of 2wd and go into natural. push the auto 4wd button will grind and slam into 4wd. if I stop and back up the push the button for the 2wd it will go into 2wd for a short period of time then it will do the samething again replaced the actuator no change -
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