1991 exploder 4x4 tranny?
 

1991 explorer 4x4 that when you put it in drive it doesnt want to go any where, it will then feel like it's slipping then slam into gear, what could it be? torque converter, pump, module, or just tranny? when I bought the truck I was told the tranny was rebuilt a couple of months before I bought it, which was about a month ago. PLEASE HELP!!