hello im new here. just bought 2002 f-350 sw shortbed 7.3 auto 4x4. my auto locking hubs not working neither. so far i have pulled vac lines at spindle. no vac. should i pull lines at pump to see if i have vaccum? then check lines for leaks. have 07 f-150 that had same prob. fixed by changing vac pump. does vac pump on my f-350 also work dash lovures?