THE UPPER LOOP , THE ONE THAT GOES UP OVER THE DRIVE SHAFT IS VERY THIN ,AND FROM WHAT I CAN GATHER AT THE POINT THAT THE DRIVELINE WOULD MAKE A NOISE , THIS LOOP WAS MADE TO VIBRATE AT EXACTLY 180 DEGREES OF THE FREQUENCY OF THE NOISE THE DRIVELINE WOULD MAKE AND BEING 180 DEGREES OUT OF PHASE IT WOULD CANCEL THE NOISE , EVIDENTLY IT WOULD WORK FOR A WHILE AS THE VIBRATIONS IS WHAT MADE THEM CRACK, , THE REPLACEMENT IS MADE ALLMOST THE SAME WAY BUT STIFFER , I HAVE TAKEN THEM COMPLETELY OFF AN D I CANNOT TELL THE DIFF ,IN MOST DRIVING INSTANCES, THE RODEO IS NOT THE QUITEST VEH IN THAT PARTICULAR AREA ANYWAY , JERRY