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I need help identifying the cause of a noise coming from within the bellhousing on my 68. It's a J code with an 85 Mustang t5 transmission, bellhousing, bearing and clutchfork. Everything works perfectly except for 1) a slight whine which is obviously a bad throwout bearing, and 2) a tcht-tcht-tcht-tcht noise that happens when the car is rolling backward with the transmission in reverse and the clutch pedal is pushed in. If I shift to neutral with the clutch pedal pushed in the noise stops or if I let out the clutch the noise also stops. The noise does not occur in any of the forward gears, nor does it occur if the car is not moving (i.e., clutch in, shift lever in reverse). Could this second noise also be caused by the throwout bearing. Everything else, clutch, pressure plate, flywheel etc are new. I took a gamble and used an old throwout bearing and lost. 
BTW, someone should publish a lexicon of car related sounds to assist folks trying to describe them. For example, "wrrinnnnn" is the sound of a bad throwout bearing.
BTW, someone should publish a lexicon of car related sounds to assist folks trying to describe them. For example, "wrrinnnnn" is the sound of a bad throwout bearing.