2wd locker questions

[72kool]

I had my mind made up to buy a Spartan locker for my truck But I thought of some questions that have me in doubt and need some help now. So starting from the beggining, I have a 72 GMC C25 with a Dana 60 and 4.10 gears. Its a 350/th350 setup. I don't like the open diff and wanted better traction for summer fun. The reason I considered the Spartan locker was easy installation and a family mans budget. My doubt comes from the reason I drive this in the winter and want a safe ride. I'm a careful driver with my truck ( cleaned up too many accidents) but the truck now is a sliding machine on any ice/ packed snow road. I will be putting some new tires on the back as well, but what would be a good solution for the traction I want without making it a hazard to drive in snow? What is the best unit that is good in the winter driving and does burnouts in the summer?