I have my 03 explorer having some problems. pinacheck ko na yun ODB ok naman, kaso minsan pag nagdecelerate ako from 80-100kph as in may parang humps ang gulong ko then kung i accelerate ko naman nawawala.. sa shaft kaya ang problema?

i also tried resetting my 4x4 kaso meron pa din pasumpong sumpong..
any ideas what could be the problem?