loud whining noise coming from transmission - 1990 classic 3.9

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DeadTom

Member
Posts
96
Location
Folkestone, Kent
ive got a loud whine coming from under the car somewhere, but only while under load, e.g. going up hill or accelerating. while cruising on the level or coasting down hill its fine. i tried coasting with in neutral and the sound went away.

any ideas?

Thanks,

Tom
 
classic kev said:
Sounds favourite but it might be a bearing on the transfer box.
Click to expand...

You maybe correct, but usually the bearing would make a noise on the overrun and be less noticable with power on. Unlike a diff which makes a noise under load but usually goes quieter on the overrun. The driven face of the crown wheel usually gets pitted as does the pinion this causes the noise under load. When the pinion is driving the crownwheel. Whereas on the overrun the crown wheel is driving the pinion with it's unworn surface in contact with the unworn face of the pinion.
 
mine too , I thought it was the transfer box because of where the whine comes from, not that bad though so I will run it till it goes!
 
Yer a feckin time waster :D

Also yer too feckin expensive u rip off merchant thats why no one buys yer stuff except the scrappy :p
 
wammers said:
You maybe correct, but usually the bearing would make a noise on the overrun and be less noticable with power on. Unlike a diff which makes a noise under load but usually goes quieter on the overrun. The driven face of the crown wheel usually gets pitted as does the pinion this causes the noise under load. When the pinion is driving the crownwheel. Whereas on the overrun the crown wheel is driving the pinion with it's unworn surface in contact with the unworn face of the pinion.
Click to expand...

Makes sense to me! I did wonder if maybe a worn pinion bearing could be a suspect but I've never heard one so am guessing.
 
classic kev said:
Makes sense to me! I did wonder if maybe a worn pinion bearing could be a suspect but I've never heard one so am guessing.
Click to expand...

Worn pinion bearings usually show more on the over run as you are slowing, as sounding like something winding down. Not as noticeable power on but still there all the same. Power on they sound like a wheel bearing with a slightly changing note, on the overrun they sound like a spin drier slowing down.
 
wammers said:
Worn pinion bearings usually show more on the over run as you are slowing, as sounding like something winding down. Not as noticeable power on but still there all the same. Power on they sound like a wheel bearing with a slightly changing note, on the overrun they sound like a spin drier slowing down.
Click to expand...

Cheers I'll bear it in mind; but mud tyres would probably mask it.
 
thanks for the replies, worn out diff was what i was thinking =/ unless it really really starts to **** me off i may just run it til it goes and then replace it. weve got a toyota van at work thats had a really noisy diff for the last year or so that is still going and doesnt seem to have got much worse.

any way of telling whether its coming from front or rear, other than just having a listen and trying to guess?
 
DeadTom said:
thanks for the replies, worn out diff was what i was thinking =/ unless it really really starts to **** me off i may just run it til it goes and then replace it. weve got a toyota van at work thats had a really noisy diff for the last year or so that is still going and doesnt seem to have got much worse.

any way of telling whether its coming from front or rear, other than just having a listen and trying to guess?
Click to expand...

Well I suppose you could try taking off a propshaft and giving it a run then swap over and take the other one off and try again but possibly more hassle than it's worth.
 
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