Here's a funny one.

This only happens occasionally, mostly on one bit of road on a slight incline, when pulling away from a junction.

I hear a small grinding or rumbling noise from the back somewhere. It sounds almost like something rolling around on the boot floor, but there is nothing. I notice it most days at one specific junction near work. I stop at the junction, and as I gently pull away, I hear the noise.

I get it now and again elsewhere. But it's mainly at the one place.

Now that is not as daft as it sounds. I had a knocking noise a few months ago that sounded like a bush worn somewhere. The main dealer couldn't find it and inferred it was in my head. In the end, I took a mechanic out to the only bit of bumpy road I knew I could replicate it, and we all heard it. They found it and fixed it.

I am thinking of something driveshaft or propshaft related. Like a joint has play and only rumbles in certain situations. I wondered if this was something anyone else has encountered and if anyone might be able to speculate what it might be? 2017 4.4 SDV8 Autobiography in black
2018 D300 SE Velar in champagne
1982 Rolls Royce Silver Spirit in green
Spiffing wheel centre caps, L322 sill repair panels, etc

Do a search for transfer box issues/servicing.

I believe replacing the fluid and resetting the clutches resolves it.

Mike

I just found a topic on it that described it as a judder, that's a fair description. The topic said "Transfer box - every 5 years or 60k miles, whichever is first" - mine has done 65k, so it must be due. Assuming never done.

Is this something I could get under warranty I wonder, or is it regarded as a service item? 2017 4.4 SDV8 Autobiography in black
2018 D300 SE Velar in champagne
1982 Rolls Royce Silver Spirit in green
Spiffing wheel centre caps, L322 sill repair panels, etc

I have something similar, it's an occasional thump which I thought was coming from rear diff.

Had it in for a look, diff apparently ok , no apparent issues there, however all 4 ARC bushes are shot, they reckon the noise is them moving about under certain load.

Getting all 4 replaced early next month, will report back.

I have had the transfer box oil changed and it is still the same.

How are the clutches reset? Is that something an indy would routinely do when that oil is changed? 2017 4.4 SDV8 Autobiography in black
2018 D300 SE Velar in champagne
1982 Rolls Royce Silver Spirit in green
Spiffing wheel centre caps, L322 sill repair panels, etc

I asked the indy about resetting clutches, he said it isn't really a thing they do as the clutches learn ongoing. He also said if you do it, the car will drive terribly until it relearns and is unlikely to be any better.

Can anyone opine if that is true?

It's been a couple of weeks now since the transfer box oil was changed. They did say the oil was a bit manky that came out. So any relearning will have happened by now. And it's still doing it. They had it in again today and they couldn't replicate it they said. 2017 4.4 SDV8 Autobiography in black
2018 D300 SE Velar in champagne
1982 Rolls Royce Silver Spirit in green
Spiffing wheel centre caps, L322 sill repair panels, etc

Calibrating the e-diff won't induce any harshness and is not something that the e-fiff learns over time. There is a single, multi-plate clutch that needs to be correctly calibrated. The plates wear over time so recalibration is required for it to operate correctly. MY21.5 D350 Vogue SE Carpathian Grey

And is this something done by just plugging it in?

This coupled with my step calibration issue in another topic is leading me to think my indy just doesn't have the correct software for L405s. 2017 4.4 SDV8 Autobiography in black
2018 D300 SE Velar in champagne
1982 Rolls Royce Silver Spirit in green
Spiffing wheel centre caps, L322 sill repair panels, etc

GraemeS wrote:

Calibrating the e-diff won't induce any harshness and is not something that the e-fiff learns over time. There is a single, multi-plate clutch that needs to be correctly calibrated. The plates wear over time so recalibration is required for it to operate correctly.

Stuart- wrote:

And is this something done by just plugging it in?

This coupled with my step calibration issue in another topic is leading me to think my indy just doesn't have the correct software for L405s.

The rear e-diff calibration is the same type of process as the transfer case centre diff calibration, initiated by the diagnostic tool issuing the appropriate command. Gap added the function to the L322's options when I replaced my L322's open diff with an e-diff. MY21.5 D350 Vogue SE Carpathian Grey

I also have that noise when moving off, nearly all the time. Just like something rolling around. Never hear it when on the move. Its driving me mad. Mileage about 28000

To be clear, it is the gearbox that adapts its clutches, not the transfer case nor the e-diff. The transfer case calibration also calibrates the range shift motor.

If gearbox adaptations are reset then the gearbox re-learn procedure should be followed to re-learn clutch settings quickly to avoid possible harsh changes that can occur whilst the gearbox slowly adapts. MY21.5 D350 Vogue SE Carpathian Grey

There is a calibration process for the Transfer Case which measures the clutch calibration angles and adapts accordingly.

This is separate to the high-low range adaption. So it can be done.

Jon 1992 RR Classic 3.9 efi Vogue
2014 Disco 4 HSE
===================
Both my fatties now gone...
Previous: 2011 L322 4.4 TDV8 Vogue SE /// 2002 L322 4.4 V8 HSE /// 2009 Discovery 3 2.7 TDV6 XS /// 2004 Defender 90 TD5 /// 1993 110 V8 Snatch Landrover /// 2005 Discovery 3 2.7 TDV6 SE (Aus) /// 1990 110 Isuzu 3.9 County (Aus) /// 1976 Series III Trayback (Aus)

See here for example:

https://www.fullfatrr.com/forum/post687085.html

Jon 1992 RR Classic 3.9 efi Vogue
2014 Disco 4 HSE
===================
Both my fatties now gone...
Previous: 2011 L322 4.4 TDV8 Vogue SE /// 2002 L322 4.4 V8 HSE /// 2009 Discovery 3 2.7 TDV6 XS /// 2004 Defender 90 TD5 /// 1993 110 V8 Snatch Landrover /// 2005 Discovery 3 2.7 TDV6 SE (Aus) /// 1990 110 Isuzu 3.9 County (Aus) /// 1976 Series III Trayback (Aus)