1996 Ford Explorer

HI, I WAS DRIVING DOWN THE HIGHWAY IN MY 96 FORD EXPLORER V6 4WD ON SATURDAY. I WAS DOING 65MPH AND HAD TO SLOW DOWN TO ABOUT 55MPH AND THEN I GO TO HIT THE GAS AGAIN AFTER SLOWING DOWN AND THE TRUCK HAD NO GEARS. ALL IT DID WAS REV. WITHOUT ANY WARNING AND WITH NO NOISES OR FLUIDS LEAKING. I PULLED OVER AND I HAD LOST EVERYTHING EXCEPT FOR PARK. THE TRANS IS NOT ENGAUGING OR ANYTHING. THANKS