I have a 1979 CJ7

CAN YOU MAYBE COMPARE IT TO ANOTHER KNOWN SOUND?

ARE YOU SURE IT'S ENGINE NOISE?

HAVE A PASSENGER SORTA CRAWL AROUND IN THE COCKPIT AND LISTEN

ONE OF THE BIG AWFUL THINGS WITH YOUR TYPE IS THE DARN CHAIN IN THE TRANSFER CASE

IT COULD BE REVERBERATING SOUND THRU THE TRANNY AND ENGINE

YOU MIGHT EVEN REMOVE THE FLOOR PLATE (I THINK IT HAS ONE) WHERE THE MANUAL SHIFTER WOULD NORMALLY GO THRU AND LISTEN

A PIECE OF HEATER OR GARDEN HOSE MIGHT MAKE A GOOD STETHOSCOPE FOR YOUR PASSENGER

KEEP US INFORMED---I HAVE OTHER RESOURCES THAT MAY AID YOU FOR ANY REPAIRS

I'VE DEALT WITH JUST A FEW QUADRATRAC MODELS----MAYBE 5, IN HELPING TO REPLACE THE CHAIN (THOSE WERE HANDS ON--PAIN IN THE CABOOSE)

THE MEDIC