the nice thing about the selectable locker is the ability to unlock it for turning. The detroit will bind in turns and what you will find is you will go straight instead of turning, especially while going down hill, and that is not a good thing. I will have 2 buttons on my dash that will let me lock or unlock at will, also since my rig will be a daily driver when they are unlocked I will have a regular open diff. then when they are locked I will have 2 spools. As for the cost marlin sells e-lockers with 4:88's and solid pinion spacers for 1300.00 each when I'm done with mine I will have 1300.00 in the pair
