Charly2008 said:

Hello,

Asking for your help a second time.

My RR makes a humming noise when running, usually around 2000 rpm, (but may happen at any range), mostly when using cruise control while going uphill.
The sound is similar of rolling on white rumble strips.
Sounds doesn't last long, 2 sec of it, then stop 1 sec, then 2sec... during 10sec top.
It disappear while accelerating.

No loose panels under the car from my last inspection.
Could it be the front diff? a cardan?

My local workshop could'nt help me on this one.

Thanks

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Datatek said:

If your car is an L322 with the M57 diesel, then odds on it's the gearbox.

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Charly2008 said:

V8 4.4 2003, M62 BMW
No noticeable vibrations in the wheel.

i fear servicing the gearbox, some recommend to let it untouched as putting new oil might create more trouble than anything else.

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holidaychicken said:

As above, slow acceleration up a slight incline will trigger the torque converter noise, if it stops at 56 mph ish then it is quite likely that as that is when the lock up clutch is fully locked and the constant slip feature of the ZF5HP24 stops.
Can be caused by low transmission fluid if you are lucky and sometimes a change of fluid for the correct spec mobil / esso Esso LT71141 and a new filter might help.

There are other reasons like driveshaft or mud build up on driveshafts, injector, engine mounts etc but my money would be on TC.

This will get you started but anything you can find by Bemble or RRPhil will be time very well spent .

https://www.rangerovers.net/threads/zf-5hp24-teardown.27361/

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