Technical Gearbox noise

[Johnspanda]

Hi evening, I hope it's been a good weekend. I wonder if anyone has had an issue with a noise from the gearbox, at least I'm pretty sure it is. As the car starts moving there is noise that seems to vary with speed of car, rather than speed of engine so I don't think it's input shaft. If I dip the clutch it makes no difference. Not sure if the drive shaft inner, joint would make this sort of sound. I'm thinking diff bearing perhaps. Gearbox is lovely and smooth to change gears. At high speed the car is fairly quiet.
Any Thought's anyone

 

[bugsymike]

Hi evening, I hope it's been a good weekend. I wonder if anyone has had an issue with a noise from the gearbox, at least I'm pretty sure it is. As the car starts moving there is noise that seems to vary with speed of car, rather than speed of engine so I don't think it's input shaft. If I dip the clutch it makes no difference. Not sure if the drive shaft inner, joint would make this sort of sound. I'm thinking diff bearing perhaps. Gearbox is lovely and smooth to change gears. At high speed the car is fairly quiet.
Any Thought's anyone

Does yours vehicle have a drive shaft support on the side of the engine with a bearing in it?
Apart from that, wheel bearings as they will increase with speed, although fronts will change the noise as you corner.
Diff bearing noise may change as you accelerate and deaccelerate affecting load on them and the diff gears.
I assume you haven't just fitted some really aggressive treaded tyres as old Land Rovers used to howl.
The other way I would check for a noise is properly supported on a wheel free garage ramp and run it up in the gears whilst some one listens underneath.

 

[koalar]

At high speed the car is fairly quiet.

Sounds more brake related, than driveline, bearing

Does the noise alter if you dab the brakes

Is the noise a scraping, rumbling or something else, a scratching sound immediately the wheels start to turn that speeds up with road speed and goes away when braking is the most common symptoms

Open the passenger window, close it open the drive window, is one side louder than the other

Do you use the car off-road, through deep water

Being a 4x4 does complicates things slightly

There's a bit added to the back of the gearbox and propshaft also in the equation

2006 will have a viscose coupling, which do fail, it's quite a quick test, lift one of the rear wheels and with a long bar, try and turn the wheel, it should spin but be quite stiff, but not locked solid, I don't think it will be this.

If I dip the clutch it makes no difference.

We can probably discount the release bearing

there is noise that seems to vary with speed of car, rather than speed of engine so I don't think it's input shaft

Correct we can probably discount the input bearing

A few quick tests, find somewhere empty

Does the noise alter if you jiggle the steering from left to right
Is the noise different if you drive at full lock, lis it different turny left form right

In first, accelerate hard for a second, take you foot off the pedal and let it engine brake, any louder or same as driving normally

 

[DaveMcT]

Gearbox input bearing will be noisy in neutral but go quiet when you press the clutch down. You would need to be looking under the open bonnet to hear it.

 

[Johnspanda]

Does yours vehicle have a drive shaft support on the side of the engine with a bearing in it?
Apart from that, wheel bearings as they will increase with speed, although fronts will change the noise as you corner.
Diff bearing noise may change as you accelerate and deaccelerate affecting load on them and the diff gears.
I assume you haven't just fitted some really aggressive treaded tyres as old Land Rovers used to howl.
The other way I would check for a noise is properly supported on a wheel free garage ramp and run it up in the gears whilst some one listens underneath.

It does have the driveshaft support, I will jack up the right side tomorrow and try and look and listen. Don't think it is wheel bearings as it doesn't change on corners. It's on Goodyear 4 season tyres

 

[Johnspanda]

Gearbox input bearing will be noisy in neutral but go quiet when you press the clutch down. You would need to be looking under the open bonnet to hear it.

I have tried neutral and clutch down, makes no difference.

 

[koalar]

It does have the driveshaft support, I will jack up the right side tomorrow and try and look and listen. Don't think it is wheel bearings as it doesn't change on corners. It's on Goodyear 4 season tyres

Are you sure

There a center bearing on the propshaft

But the driveshafts need to be able to move up and down with the suspension

 

[koalar]

I have tried neutral and clutch down, makes no difference.

Eliminates a fair amount of the gearbox but not all

Is the noise a scraping, rumbling or something else, a scratching sound immediately the wheels start to turn that speeds up with road speed and goes away when braking is the most common symptoms

Do the brakes effect it

 

[bugsymike]

It does have the driveshaft support, I will jack up the right side tomorrow and try and look and listen. Don't think it is wheel bearings as it doesn't change on corners. It's on Goodyear 4 season tyres

Just a thought , will you be able to test it safely with four wheel drive?
I have changed that driveshaft support on other makes of car due to noise.
However was able to safely support on a garage ramp and run the car up in gear whilst underneath so easy to locate the noise.

 

[Johnspanda]

Are you sure

There a center bearing on the propshaft

But the driveshafts need to be able to move up and down with the suspension

The noise is at the front, I have already replaced the centre bearing on the prop a year ago, that's all good

 

[Johnspanda]

Just a thought , will you be able to test it safely with four wheel drive?
I have changed that driveshaft support on other makes of car due to noise.
However was able to safely support on a garage ramp and run the car up in gear whilst underneath so easy to locate the noise.

It won't be easy to get all 4 wheels off the ground but to turn the front wheel I can jack up at the front until back wheel comes off the ground I did the left side last week so will try the right I can get to see the drive shaft support bearing at least. Thanks for your help. John

 

[koalar]

I no idea what we are talking about at the moment

The front driveshafts connect directly to the wheels

Here's the long one on a 4x4

 

[DaveMcT]

Wheel bearings can groan badly but be no worse when cornering. See if you can get a ride in a car with known good wheel bearings.