Whining noise from rear end

[Rubce]

Hi All

When the car reaches 30mph a whining noise starts and gradually increases as the speed increases:X. It reduces if I take my foot off the accelerator. It does not vary going around corners.

I fitted a new front nose extension bearing to the diff during the resto so it isn't that.

I did not replace the rear wheel bearings due to the agro of taking the hubs apart. However, I would expect it to be a low rumble if it was one of the wheel bearings and for it to vary as it cornered.

The diff is mounted on poly bushes. Perhaps it is a simple case of the diff noise being amplified?

I am also wondering if the whining noise could be created by the exhaust rubbing on where it passes through the rear cross members?

Or is it case of the diff being bug**red?:?

Any suggestions?

Regards

Bruce

[Andy Rundell]

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my money would be on a tired diff ...... but, i would expect it to be perfectly serviceable for a long time yet - mine has been like it since i bought the car. I was very tempted by Stagdad's old diff for sale recently, but my piggy-bank was empty !

..............Andy

[DJT]

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Hi Bruce,

If a Stag diff whines it isusually (but there is always the exception )around 50-60 mph.

Does the noise change if you depress the clutch? That may eliminate (or confirm) release bearing or gearbox input shaft bearing.

As it doesn't vary going around corners it may indicate that the wheel bearings aren't the source.

If it is the diff, then the poly bushes would exaggerate it. There are 'voided' poly bushes around that are less solid.

Dave

[Gresley]

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Hi Bruce,

My diff started whining a little some time time ago. I changed the poly bushes for rubber and changed the oil for some EP85 / 140 which Paddocks sell. The result is that the whine has gone!

My PI Estate has the voided poly bushes on the diff and is perfectly quiet, so these seem Ok too.

Hope this helps.

Brian

[Rubce]

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Gents

The poly bushes are of the voided variety and I fitted a new clutch release bearing when I fitted the new clutch etc so I doubt its that.

I did not notice if the noise changed when I pressed the clutch pedal but I do remember it reducing when I took my foot off the accelerator. I will have to take the car out for another test drive later this week once the rain stops.

Might get hold of some of that thicker oil that Brian mentioned.

Thanks

Bruce

[Andy Rundell]

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Rubce wrote:

Might get hold of some of that thicker oil that Brian mentioned.

Gotta be worth a try :dude:

[dasadrew]

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Rubce wrote:

Hi All

When the car reaches 30mph a whining noise starts and gradually increases as the speed increases:X. It reduces if I take my foot off the accelerator. It does not vary going around corners.......

Bruce

I had a similar noise once but found out that it stopped if the mother-in-law wasn't on the back seat.

[Stagdad]

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Andy Rundell wrote:

I was very tempted by Stagdad's old diff for sale recently, but my piggy-bank was empty !

..............Andy

Andy,money for the diffwon't stay in my bank long:P.Already spent it 3 fold in my head.
Bruce re whining from rear, check for wife/children siting in the back (old ones are the best) Drew beat me to it:P.

BTW I have also reverted back to rubber for subframe to body mounting and drag strut rubbers

Cheers Steve

[Andy Rundell]

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Stagdad wrote:

Andy Rundell wrote:

I was very tempted by Stagdad's old diff for sale recently, but my piggy-bank was empty !

..............Andy

Andy,money for the diffwon't stay in my bank long:P.Already spent it 3 fold in my head.
Bruce re whining from rear, check for wife/children siting in the back (old ones are the best) Drew beat me to it:P.

BTW I have also reverted back to rubber for subframe to body mounting and drag strut rubbers

Cheers Steve

i think we are all the same !!! in fact i'm quite impressed that it isn't spent for real rather than in your head

..............Andy

[Stagdad]

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Andy Rundell wrote:

Stagdad wrote:

Andy Rundell wrote:

I was very tempted by Stagdad's old diff for sale recently, but my piggy-bank was empty !

..............Andy

Andy,money for the diffwon't stay in my bank long:P.Already spent it 3 fold in my head.
Bruce re whining from rear, check for wife/children siting in the back (old ones are the best) Drew beat me to it:P.

BTW I have also reverted back to rubber for subframe to body mounting and drag strut rubbers

Cheers Steve

i think we are all the same !!! in fact i'm quite impressed that it isn't spent for real rather than in your head

..............Andy

Watching a 1: 3.25diff as we type for similar money that mine was,only difference is this one is lsd and bulletproof.I need to gear up a bit due to smaller rolling radius from low tyres.

Cheers Steve.

[richardthestag]

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Rubce wrote:

I fitted a new front nose extension bearing to the diff during the resto so it isn't that.

Hi Bruce

I did ^^^ that annually for about 4 years on the trot. I eventually sourced a diff nose bearing from a bearing supplier rather than Stag specialist and my problem has gone away for 2 years now. they used to last about 2k miles before grinding away. On disassembling I found that the seal on the bearing had failed and shat all the grease out, causing the bearing to run dry.

I got to be a dab hand at dropping the diff off the car.

Another cause of an irritating squeal - aside from the mrs accidently trapped in the boot :dude:was a uj cup slipping inside the yoke. Made a hell of a noise. Sorted that by jacking up each rear corner in turn and running the engine in gear. (I don't have one of those fancy LSD diffs) one side was noisier than tother, disconnected inner uj from diff and noise went away. Trouble is that while all that was going on I was in the thick end of replacing dead diff nose bearings as part of my sevice shedule:Xso it took me a while to get to it.

[elvimto]

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Bruce,
I have a MK 1 auto I have the almost the same just went through the diff but used the existing ring and pinion they were a bit iffy as gears go but at 400 or so for replacement i went with it. I beefed up the quill extensiion new bearing and such but the whine noise starts about 30 or so, I used redline diff oil but I am going to change it to a Lucas brand to see if that quitens it down a bit. I found another diff here that looks a whole lot better and turns good so when I get a chance I will replace the one in the car. The whine almost goes away when you let up on the gas so it must be in the gearing mesh mine has the correct backlash etc I only have about 80 or so miles or so since it was put back on the road I used rubber mounting bushings.

Good luck Stuart
smart resto by the way

[Dave M]

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All this talk of changing diffs, Ive got mine to do as the backlash (I think) in mine is causing clunking noises. Can the diff be dropped out with the car still on its wheels? The reason I ask is because I have a set of hydraulic ramps and getting the car in the air whilst still on its wheels is easy.

Dave

[nib]

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Dave,do you know how easy it is to sort the backlash out,the reason I ask is that I have a nice and quiet diff in the shed that has a bit too much backlash.

Mark

[Dave M]

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nib wrote:

Dave,do you know how easy it is to sort the backlash out,the reason I ask is that I have a nice and quiet diff in the shed that has a bit too much backlash.

Mark

Sorry Mark I dont, Ive took a chance on as/h diff thats supposed to be good, was hoping to get my diff sorted but dont know whats involved, perhaps someone on the forum will enlighten us.

Dave