Hey I have a quick question. I have an 03 gmc sierra 4x4 z71. Its got 3.73 gears front and rear. Im goin to be throwing on a cognito lift here shortly and need a new front diff since the ear is missing. I was wondering what front diff would be compatable with mine. I will also add my front driveline spins free when in park. So this means I have the newer style transfer case. Does that have anything to do with the front diff?