Just fixed that on mine - 350 ci carb. Noise came from transmission (stationary gear to ring gear in gear reduction chucking) due to rough idle in my case due to vacuum leak caused by wedge to intake manifold leak. Apparently gasket was incompatible ...
The noise may be coming from the transmission but is usually caused by a rough idle causing the transmission gears to chuck (fixed gear to ring gear in the gear reduction behind the velvet drive straight transmission in my case). Just found that on m...
