Mechanical lockers in the front axle are not for driving in the snow on I-80 or any other freeway period they are great for wheeling i.e. snow , mud, dirt, rocks but not driving on pavement for any other reason than to get home. I had one had 6 years on it and know it has new gears and bearings and is still going strong if you want to be able to drive your truck get an ARB or electric, in your case blackdog it's is cheaper than gears so I would go with that unless you drive in the snow i.e. on the freeway through chain control.