You guys all rock. Great feedback. I'm going to remove the inspection cover and look. Was thinking heat shield too for a bit because the one under the battery started rattling a year or so back. This sound is further back. I can't picture any such thing further back as ToyotaMatt suggests so...
1969 FJ40
rebuilt engine
original 3-speed tranny and original transfercase
I have this chatter sound that is driving me nuts. I'm fine with the high pitch whirring of transmission and hum of tires but this chatter is driving me nuts.
Under load by speeding up fast or ascending a hill it goes...