here's my 2 cents. if you live in an state that has winter weather and you plan to use your truck year round a locker setup is definately not the way to go. driving on slick roads with a "lockup" rear can get VERY exciteing. a locker set up is spendy also. if you went to a local boneyard you should be able to trade your rear end and a couple hundred bucks for a posi rear, but then again winter driving will be white nuckle time