Hey all new here, 2005 ford ranger fx4 level 2 i have real bad acceleration from 0-20 and jerking 0-20, had the tranny rebuilt in december, it was doing this before, after rebuild nothing changed, mechanic said it could be transfer case or rear diff, any suggestions ? I have replaced plugs and wires, new tps, clean iac, no vacuum leak, had thermostat housing recently replaced due to leak, truck has 107k, please help