Air suspension pump will not turn on and when accelerating from a stop there is a loud popping noise coming from the front differential

My SUV listed above is an awd 6.0. Dealer say both problems listed above maybe caused by ABS. I don't here it when I turn left or right. I have no codes showing up on dash I bought an Innova 3160b ABS -SRS obd2 scanner and pulled no codes from ABS or any were else. So far for differential I pulled it out and mechanic took it apart said they seen nothing wrong fluid also looks good and say I may have some kind of drive-line slip cause by ABS system. Okay, so I put it all back together and now for the suspension pump I did all the following I check for codes again got nothing. So I automatically just changed out the air compressor, cleaned the ground under driver side seat for ABS pump also ground for air pump. Changed both ABS hubs and sensors in front, changed to front electronic shocks and rear air shocks, and left front CV joint. After all that I hot wire the pump to see if air pump works and it does, so I check all fuses and replaced gray suspension relay outside fuse box didn't work. I turned the key on checked the relay for power and red power wire from fuse box it has 13.91 volts the other red wire going to I guess pump it has fluctuating numbers Ald. .005-.071 the brown wire had.008 steady and the blue wire had fluctuating numbers approximately. .005-.071. Okay, so with no power coming out the other side of the relay I bought another relay plug wired it up tested it I got the same readings and still nothing works differential or air pump. Please tell me what's wrong.