97 explorer has a noise at highway speeds mainly when just starting to slow down grinding/ratcheting noise. Best way to describe would be like a gear clash loud whirring like to gears trying to mesh poss. around trans area auto trans no problems other than noise

 

i think i have the same thing and it is my transfer case
it is like you let off the gas and it sounds like you spin a ratchet
and the RPMS drop to idel i got a rebuild 1 with 1 year
warranty for 795. free shipping from monster transmission online