THERE AREA COUPLE OF THINGS UNDER THERE THAT WILL CRANK AND BREAK LOOSE AND RATTLE DEPENDING ON ENG RPM, EXHAUST HEAT SHEILDS ARE VERY COMMON, BUT ALLSO TAKE A LOOK AT THE BACK END OF THE TRANS THIS WILL ONLY APPLY TO A 2WD UNIT , WHERE THE TRANS SITS ON THE REAR MOUNT , THERE IS A SQUARE BRACKET BOLTED TO THE MOUNT ITSELF , AND THEN ANOTHER BRACKET THAT GOES UP OVER THE TRANS IN A SQUARED CORNERED LOOP, ALL MOST THINK IT WAS A DRIVE SHAFT SAFETY LOOP, BUT IT IS FOR NOISE HARMONIC CANCELING , AND THEY ARE NOTORIOUS FOR BREAKING AND RATTLEING , IF IT IS BROKEN JUST TAKE IT OFF AND THROW BOTH PIECES AWAY, YOU WILL NEVER MISS THEM, I HAVE SAW A COUPLE OF THOSE THINGS BREAK AND FALL DOWN ON THE DRIVE SHAFT AND ACTUALLY CUT THE FRT OF THE DRIVE SHAFT IN HALF, AND NO ONE EVER SEEMS TO HEAR IT UNTIL THE SHAFT FALLS OFF, IT IS MADE OF ALUMINUM SO IT DOESNT TAKE LONG TO GET MESSED UP . JERRY