I just bought my 2002 ford ranger xlt 4x4 yesterday. And I notices that from a complete stop, my truck jolts 1-3 times when I start accelerating. I'm stumped on what it could be. The dealer guy said that since it's a 4x4 the axel shifts when it stops, and just goes back in place. But to me it seems like that isn't the deal. Any help? Please!