hi ,sorry if this subject has already been discussed but I have a specific question.I have a friend and someone gave him a mini spool to put on the rear axle of his sidekick.He installed it and when the truck is loaded or when he has a gear in and uses the throttle,it works ok except that its not unlocking.O.K,normal for a mini spool someone would say.The problem is that when he just lets the truck roll on the street ,a loud annoying noise comes from the diff with the spool.Is this normal ? If not ,what could be the problem ?
Thank you .