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.
Re: WHat is the intermittent droning noise in 5th gear of...
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. http://www.manualtransmissionpart.com/mm5/graphics/pdf/t3650-2012.pdf
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.
Re: WHat is the intermittent droning noise in 5th gear of...
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
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
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I am guessing that the selector fork has not been tightened up on the selector rail and you are moving the rail back and forth but not moving any gears . Otherwise there would be crunching noises going on.. Take it back to the mechanic and tell him to fix it properly.
the 5th gear ( overdrive ) is in the extension section of the box and has a bearing in the housing on the end of the lay shaft
The noise may not be a bearing as the noise described is for mismatch of the gear mesh or chipped tooth on the overdrive cog
so the end section of the lay shaft has a bearing either side of the large gear on the lay shaft as it drives a smaller gear that is connected to the out put shaft by a syncro dog that is moved on gear selection
check the viscosity of gear oil in use as the manufacturer specifies very light mineral oil and that allows tooth contact and wear if carrying loads ( towing ) or speeding
I personally use OEP 80/90 gear oil in manual transmissions , same as what has been in use for many years
D5. This will use all 5 gears. D4 will not shift into 5th (overdrive). This causes higher revs on the highway, more noise and less fuel mileage. D4 is only really used when going down long hills for better engine braking. Leave it in d5 and let the cars computer do the shifting for you.
the car will try to drive as economically as possible,so will try to run in the highest gear for a given road speed,in town driving,it is more comfortable if the o/d is OFF.but for cruising at,say,45mph,with a light throttle then o/d should be ON.
There isn't anything wrong with your car. This is perfectly normal. I have a 2000 ES300 as well as other people that I know and it operates in the same way. Overdrive doesn't mean the same thing for every car or transmission. In our case overdrive is simply a reference to the top gear which is 4th gear. When you switch overdrive off(which is depressing the button causing the O/D OFF dash light to illuminate,) the highest gear becomes 3rd because you turned 4th gear or overdrive off. The application scenario for this is usually mountainous terrain where a lot of uphill driving makes it more feasible not to up shift into 4th gear while ascending and descending. It will not switch back to overdrive or 4th gear until you re-engage it by turning the overdrive back on or repressing the button. Again, when the O/D OFF dash light is illuminated, overdrive which is 4th gear is off and the highest gear will then become 3rd. It will never shift into 4th gear while this light is illuminated or overdrive is off. When you press the button and the O/D OFF dash light is NOT illuminated overdrive is on and therefore it will shift into 4th gear as usual. This applies to all 97-2001 ES300's and probably any other car you drive tat exhibits this same type of change when overdrive is turned off.
Well, you say the noise is in 1st, 2nd, 3rd, and 5th, and I assume this is an overdrive tranny with the overdrive in 5th.
This means your 4th gear is more than probably direct (1:1) ratio.
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.
Either way your tranny has serious internal issues and needs to be rebuilt before it destroys itself.