[K20cheyenne]

I have the original detroit locker (no-spin) in my 72 K20. It has never made a noise and yes it is working perfectly. The only excessive tire wear I've experienced is from being able to spin both tires at the same time for a good smoke show. There is some free play in it, that is normal, and at times it can sound pretty bad when the slack is taken up from a stop or forward to reverse but it is normal and nothing to worry about. I've done some pretty hard wheelin' and the only thing I ever broke was the front axle shaft, and a new paint job. These rear axles are very stout. Best of luck on your install.