Question about 2001 Ford Mustang V6

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WHat is the intermittent droning noise in 5th gear of my Mustang when driving?

In overdrive/5th (?) (highest gear), there is an intermittent droning. Like Rrrrr... rrrrr. NOT a sound of increasing RPMs. It only happens when clutch is engaged. SOund is rhythmic but doesn't sound wheel related, since it stops as soon as I disengage the clutch.

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Assuming the car is still rolling when you're disengaging the clutch and it happens in no other gears except OD and it is a TREMEC TR-3650 trans, though you didn't list engine size or mileage, my guess would be that an input shaft bearing or the bearing in rear of the shaft the 5 the gear is on could be the problem.
raising the car off the ground safely with a person working the controls , get under the car and attempt to recreate the symptom and listen with a probe if necessary to the driveline starting in the front of the trans working rearward.If it cannot be duplicated off the ground it doesn't mean that the troubles still don't lie in the trans. you might try shutting off the engine while the clutch is disengaged being aware your p/steering will be ineffective at the time so do it in a safe area on straight road and see if the problem continues.
keep your hand off the gearshift when you are testing also, if the noise stops with your hand off then possibly you have a worn shift fork shoe likely though my best guess is the 257 bearings in the linked diagram.
Happy hunting

Posted on Nov 21, 2014

Bearing inside the trans would be my guess

Have to pull it,take completely apart & change
all the bearings & hope for the best

First I would have the drive shaft checked for
being straight & have it balanced

2001-- loose the drive shaft joints

Check or replace ALL motor & trans mounts
& check any rear axle suspension bushings

Standard Trans have issues that require a lot
more work to diagnose & find a problem, than
an automatic

If & when you ever do the clutch, you balance
the flywheel, then bolt on the pressure plate &
balance the complete assy

Do not rule out the rear axle bearings

With a 14 year old vehicle,if you do All your
own work, you got only things to learn,so replacing
a few old worn parts to find a problem, is not really
a waste of time or money,because you need to fix
the issue & learn something

If your paying someone,I would forget all I said

Posted on Nov 21, 2014

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Meaning you have a bad countershaft bearing(s), or gears...

In direct, your countershaft still spins but carries no power/torque to the wheels (it is basically just freewheeling), input shaft speed/torque goes directly/is locked to the output shaft, so you don't hear the noise; in any other gear, where the countershaft bears a load, you hear the bad bearing or gears.

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