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[Entwood]

Doesn't the 2.6 have a different ratio diff? 

Yup .. that's why just the drive shafts from the 2.6 ....

Nige if it`s just a driveshaft/s think I`ve got 2 knocking around in the shed

Thanks for that ... lets see what Mr S makes of it tomorrow ..should have a better idea then.   

[Entwood]

The saga continues...

Went to see Mr S (again), he agreed the noise is not good, but despite taking various things off he cannot find anything that he thinks is making said noise ....

We now have the following noises...

At low speed, around 15-20 mph, a continuous mechanical grumble/grating both on light drive and over-run

at around 30 mph with light drive a continuous "shhhhhhhhhhhhhhhhhhhhhhhhhhh" noise that stops on over-run

at 40-50 mph with light drive  the "shhhhhhhhhhhhhh" is still there but a whine builds up

above 60 my high tone deaf ears no longer register it !!

Steering, both gentle and violent, makes no difference, nor does braking both heavy and light, applying handbrake both lightly and firmly changes nothing except the tone of the noise as the speed changes. I have even tried maintaining speed with power whilst applying brakes .. no apparent difference.

As previously stated, it seemed over the weekend that the noises were much reduced with the tin-tent on the back.

I have tried taking a sound recording with the phone, but until I work out how to get it off and uploaded I'm unsure how useful it may be.

Mr S is somewhat stumped and suggests that it will eventually get so bad the cause will be obvious ......... at which point I'll know what to change !!!! 

Once again I must express my thanks to Mr S for spending 3 hours trying to find the cause, and refusing to take any recompense for his time.

Any ideas gratefully accepted...

[tunnie]

Does it change based on revs?

Torque converter? 

[feeutfo]

Exhaust?

[Entwood]

Does it change based on revs?

Torque converter? 

Knock it into neutral and do what you like with the engine .. the noise is speed related NOT engine RPM related

try it in the different gears at the same speed, engine noise changes with rpm obviously , but the nasty noise is constant.

It really does seem to be totally rear drive train speed related

[Entwood]

Exhaust?

Mr S checked the exhaust for various noises/rubbing.... found nothing amiss .. and to be honest it is a "rotational" sound and far too "mechanical" to be a blow.....

[feeutfo]

Ah, ok. Got another 3.9 dif here if you want to try a known good..? Trouble is I'll want it back at some point.

[tunnie]

When it's popped in N, as I understand it that disconnects TC until put into a gear? Sound you describe is what I had a project what the TC was not pushed fully back.

It's unusual for a diff to go, although Bob Dents did fail. But recall him having mega big alloys which might have been a factor. Might be worth a call/Pm to him?

[feeutfo]

Not a case of disconnecting each part, hub, drive shaft, dif, prop, back to the gear box until the noise stops...? Easy sitting here mind.

[Entwood]

Ah, ok. Got another 3.9 dif here if you want to try a known good..? Trouble is I'll want it back at some point.

Mr S is not convinced its the diff or drive shafts, and thinks replacing could be a waste of money, however I'm tempted to buy the set from the 3.0 Rob is breaking in Bristol.

[tunnie]

Just a thought, but what about getting a tow? Disconnect the drive shaft and see if the noise is still present?

[YZ250]

Would you be able to identify the area any better if someone laid in the back with the sender cover plate removed.    Road noise would probably block it out though.    Probably already done this with sassanach.

[Andy B]

What's the input taper bearing into the diff like? (it's the bearing you need to take note of the pre-load if you change the diff input oil seal) 

[Entwood]

What's the input taper bearing into the diff like? (it's the bearing you need to take note of the pre-load if you change the diff input oil seal) 

I've no idea what it is like .. but 2Woody changed the diff input seal for me last year ....... do you think this could be related

[Andy B]

What's the input taper bearing into the diff like? (it's the bearing you need to take note of the pre-load if you change the diff input oil seal) 

I've no idea what it is like .. but 2Woody changed the diff input seal for me last year ....... do you think this could be related

The prop input to the diff on my Senator showed signs of a fubar'd bearing ie there was movement when you tried to move it. It showed as a slight whine on over run, but you could make it seem quiet by giving the car enough revs to balance between drive & over run. Nipping the bearing up seemed to fix it -

(you need proper 'rolling torque wrenches' to set up the preload correctly hence MarksDTM advise to mark up the lock nut so you can make a reasonable guess when re-loading the bearing.)