Gearbox noise worse when turning left!

 
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liamh
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PostPosted: Wed May 24, 2017 8:19 pm    Post subject: Gearbox noise worse when turning left! Reply with quote
My gearbox has started to make a bit of a whining noise when above 40 mph. The noise isn't constant, on a straight road the noise comes and goes but going around a long left hand bend the noise is constant, going round a right hand bend there is no noise!
Sounds like a bearing but can't figure out why the noise disappears on a right hand bend.
Only seems to do it when things have warmed up.
Any ideas?

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Liam
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Yule
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PostPosted: Wed May 24, 2017 8:39 pm    Post subject: Reply with quote
Hi Liam,

I'm not sure that your noise is coming from the gearbox - it would not be affected by direction if it was the box. Sounds like a bearing to me, squealing when under load.
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Alan Drover
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PostPosted: Wed May 24, 2017 9:44 pm    Post subject: Reply with quote
Evening liamh.
As the noise occurs only on left hand bends then it's possible it's a wheel bearing on the right hand side as the weight is on the right hand side on a left hand bend.
Jack the right hand wheels up and spin them listening for any noise from the bearings.
. Alan Drover
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liamh
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PostPosted: Wed May 24, 2017 9:58 pm    Post subject: Reply with quote
I checked all the wheel bearings, all are ok.
Forgot to say, i can make the noise louder by pushing any of the gear sticks forward. The overdrive lever has the most effect, i swapped the overdrive for a spare unit i had just overhauled but this made no difference.
I have even removed the floor to check nothing was touching the gearbox or engine but nothing anywhere near.

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Liam
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Alan Drover
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PostPosted: Thu May 25, 2017 6:48 am    Post subject: Reply with quote
Rear diff?
. Alan Drover
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liamh
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PostPosted: Thu May 25, 2017 10:08 pm    Post subject: Reply with quote
I had thought about the rear diff as I know it could be in better condition but the noise is definitely from the front somewhere.
Have had a passenger today climbing around in the cab as I've been driving to try and find where the sound is from, they were 100% sure it was the gearbox.
Going to have another crawl around underneath tomorrow.

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Liam
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Yule
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PostPosted: Fri May 26, 2017 9:53 pm    Post subject: Reply with quote
Is it the overdrive itself? Try removing it and see if it makes a difference.
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liamh
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PostPosted: Sat May 27, 2017 9:04 am    Post subject: Reply with quote
I originally thought it was the overdrive so I overhauled a spare one I had and fitted that one.
But there was no difference in the noise.

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Liam
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Alan Drover
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PostPosted: Sat May 27, 2017 9:05 am    Post subject: Reply with quote
Prop shafts?
. Alan Drover
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liamh
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PostPosted: Sun Jun 04, 2017 10:19 am    Post subject: Reply with quote
I've checked the prop shaft, all ok.
Also checked all the wheel bearings again.
And even tried a different diff in the rear axle!
Noise still the same.
I'm sure it's the gearbox that's making the noise, a mate has a spare gearbox that needs the reverse gear fixing so the plan is to rebuild that one and fit it. Then I'll take mine apart and see what's going on.
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