Car making grinding noise

I was driving and heard a grinding/breaking sound; instantly the car wouldn't accelerate. I am thinking it has got to be the transmission, but I don't know if it is the whole thing, a stripped gear, or something else.
Experienced mechanics share their insights in answering this question :
There is a good chance that what you heard was the transmission. Transmissions are very complex systems. It is very likely that the transmission will need to be overhauled or even replaced, depending on what part of the transmission has failed. I suggest hiring a mobile mechanic, such as one from YourMechanic, come out to inspect the grinding noise coming from your transmission.

How to Identify and Fix Common car Problems ?

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If you notice your car making a grinding sound when it accelerates, your issue is likely to do with your transmission, a problem with your differential, a bad wheel bearing, a damaged CV joint, or a worn engine/motor mount.
Scraping noise while accelerating

A scraping noise whilst accelerating may be the result of a number of things; from a deteriorating transmission or timing belt to a damaged wheel bearing or brake pads. For this reason, it`s worth taking your car for a check-up with a mechanic who can determine the cause.

If your car has an automatic transmission, one of the most disconcerting noises that you can hear coming from your transmission is a grinding noise. When a grinding noise occurs with your transmission, it could mean a serious problem with your planetary gear system.
The grinding sound you hear is that collar colliding with the end of the gear if it is spinning at a faster or slower speed than the shaft in your transmission. Modern transmissions minimize this grinding by adding a synchronizer ring before the gear that helps get the collar and input shaft up to speed during a shift.
Grinding Noises from the Transmission

Even if the levels are high enough, if the fluid is dirty, it can`t lubricate the parts like it should, causing these unusual and unwanted noises.

If you are getting a grinding noise from the front wheels when driving then the most common cause is the brakes are worn causing the brake pads backing plate rubbing on the rotor metal to metal. Have you brakes inspected to see if just the one side is worn down indicating the caliper is sticking.
A grinding or shuddering sensation is common when a transmission has trouble shifting fluidly. Sounds: Any grinding noises while shifting or knocking noises while in neutral are clear indications of a transmission in trouble.
Grinding gears is one of the most common signs of a transmission problem. It means that the clutch isn`t completely disengaging from the engine while the gears are still rotation. However, there are numerous reasons why it could be happening. In some cases with a manual transmission, it`s actually user error.
Automatic transmissions work similarly to manual ones, but the key difference is that the car shifts gears automatically based on preset RPM settings. However, while grinding sounds are more common in manual cars, automatic transmission grinding when shifting can still happen.
If you are grinding gears in a late model car, without a doubt the brass synchronizers are worn, and like anything else continued grinding will eventually end up with losing a gear and iron filings will be in the transmission oil which will wear other parts and eventually the transmission will fail.
Grinding noises, transmission leaks, burning smells, noisy idling, and shifting delays are all common symptoms of a clogged filter.
A loud noise coming from your vehicle when you accelerate, particularly one that sounds similar to a lawn mower is most likely due to an exhaust system leak.
The bearings are what allow the cam and crankshaft to spin for thousands of miles and millions of revolutions. If any of the bearings fail they will cause a ticking or screeching noise. Again, the noise is more noticeable on acceleration because the engine spins faster. The pistons can also wear and make noise.
A grinding or shuddering sensation is common when a transmission has trouble shifting fluidly. Sounds: Any grinding noises while shifting or knocking noises while in neutral are clear indications of a transmission in trouble.
A common cause of grinding noises under your car are failing wheel or hub bearings. Wheel bearings allow the wheel and tire to rotate and are designed for low friction, while hub assemblies have an additional responsibility of securing the wheel and tire to the vehicle.
As you drive, the bearing rides on a metal axle shaft. This reduces friction as your wheel spins. When the bearings experience too much stress, they can become worn thin. This can cause a grinding or scraping sound to occur.
If the sound resembles humming, buzzing, or clunking, you may be experiencing transmission failure. Bad automatic transmissions may emit humming, buzzing, or whining noises while manual transmissions have harsher “clunking” sounds.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Car makes grinding noise – 1996 Chevrolet Corsica
ANSWER : Hey there, thanks for writing in. I would have a professional mechanic check out the constant velocity joints on your vehicle. One or more of them may be worn enough to cause the noises you describe. S/he can diagnose and replace any failed CV joints.

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My car makes a really annoying noise and sometimes dies right after
ANSWER : Hi there. From the description you have provided your vehicle’s moaning noise and intermittent stalling problem could be any number of things. It could be a failed alternator diode making the moaning noise and affecting the idle.

A failed alternator diode(s) allows voltage to flow both directions or no flow at all resulting in noise heard and erratic electrical operation. It could be a faulty idle air control valve. The idle air control valve can make noise and would account for the erratic idle and sporadic dying. It could be an accessory component, such as an A/C compressor, serpentine belt tensioner, or idler pulley, power steering pump making noise and placing undo load on the engine at idle. If you would like to have this done, a certified professional from YourMechanic can come to your car’s location to diagnose the noise and stalling issue.

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Switched to 4WD – did fine for a little then started making grinding noise. Now car won’t move and the 4WD light is blinking.
ANSWER : Hi there. If the 4WD light is blinking and you hear a grinding noise when the transmission is in drive or reverse only, then the transfer case has either broken the fork inside the case or the syncronizer jammed up and is grinding the gears inside the case. If the noise is not coming from the transfer case, then the front differential could be damaged. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your 4WD not working issue.

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car making womp womp noise and pop
ANSWER : A common cause of a noise like that is tire belt (internal) separation, flat spot(s) on tire or other tire defects. If the tires end up being excluded during a diagnostic, the CV axles, wheel bearings, and unfortunately the transmission and clutch have to be considered. The noise on turning is suggestive of a possibly defective outer CV joint but very loose tie rods ends and ball joints can sometimes be implicated. Also, it is possible to have a bad strut bearing, in the strut mount. Keep in mind, a "combination" of faults might be in play here. Your best bet is to request a front end inspection/diagnostic during which the responding certified mechanic will get this resolved for you insofar as identifying the root cause(s) and estimating the repair for you.

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Car makes a grinding noise when moving forward but nothing while you’re moving backwards
ANSWER : There are a few things that could be causing your grinding noise. Typically this is a sign of worn out wheel bearings, but that can also happen in reverse as well. It’s possible that you have a transmission issue or a front wheel brake rotor is warped. The best way to know for certain is to have one of our professional mechanics test drive your vehicle to help them diagnose the grinding noise so they can recommend the correct action that will solve your issues.

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grinding noise while turning right or driving straight
ANSWER : Hello. If the noise is still there when the engine is off and if you are not turning the wheel, then it is typically either a failing bearing in the rear differential or it can be a failure in the transfer case if it is four wheel drive.

The transfer case is a very common failure on this vehicle. If it is two wheel drive then I typically start by draining the oil from the rear differential and inspecting the fluid for metal.

Any metal in the fluid indicates a bearing failure. If that is also fine, then it may be an issue within the transmission. It may be a failure in one of the thrust bearings. If you need to get this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your car’s grinding noise.

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Car makes noise only in the morning
ANSWER : Hello. Thank you for writing in. When the vehicle sits for an extended period of time, the oil collects at the bottom of the engine due to gravity. This causes the engine and components in which the oil lubricates to run dry. There is no problem with this while the engine is off, and every car does this. Now when the vehicle turns on, the engine will need a moment to circulate that oil throughout the engine. Once the oil becomes warm enough to be the viscosity in which the engine desires, and everything has had a moment to become lubricated again, there should not be any more noises coming from the valves. If this is a new noise or it is irritating to you, you can attempt to change your oil or maybe even change the type of oil that you were using. The noise is simply the engine not having oil when it first starts up. But this is normal.

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I want my car repaired but not sure what the problem of th e car is. lately when i start the car it just makes a grinding noise an
ANSWER : If you have confirmed that there is a loud grinding noise on starter activation, that means one thing and one thing only: the starter motor is failing, likely due to an internal fault such as a bad starter drive gear, and will eventually stop working. Depending on the mode of failure, teeth on the flex plate that engage with the starter can get damaged. Even as the problem is only intermittent now, the wisest thing to do is schedule starter replacement.

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