I'm fairly new to a Four-Wheel drive set up. So here goes... When i put my 76' k5 in four wheel i'm gettin a poping noise coming from the front end axle. I know the left side locked, but the right side is wierd. How does the manual locking system work? i also have trouble locking and unlocking and getting it out of four wheel. Can i leave one side locked and the other free? A buddy told me that the noise is coming from the hubbs not being completely locked.. is this the "poppin" noise? What is a remedy for some of these problems?