Winter driving and differentials.

[verdigo]

Well winter is coming and my 245 really sucks in wet snow and ice, so Im looking for a limited slip unit to bolt in. It would be nice to know what Im looking for though as far as how to identify through VIN or a data plate before I go to the junk yards. I suppose I could drag along a floor jack to get them up high enough to give the rear tires a spin. Im now in my 50s though and look for the path of least resistance when possible. Any on line pages with specs???
Thanks
Dennis