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Thread: The rear locker does not disengage

  1. #1
    Join Date
    Mar 2020
    Location
    Melbourne
    Posts
    2

    The rear locker does not disengage

    Hi, I have a D5 MY18 3.0 diesel TD6 equipped with an active rear differential lock and having done 78000kms so far . About 15000 kms back the rear locker would not disengage when turning below 40 kmph and this would produce a lot of noise as if the differential teeth were slipping, something like loud thudding noise. Obviously the transmission is taking some abuse. This happens about 50% of the time. I presume it is some software issue where the rear locker doesnít engage some times. Happens more often when on an incline and the noises are louder. Has anyone else faced this issue? If yes please advise. Thanks in advance.

    Tejinder.

  2. #2
    Join Date
    Oct 2011
    Location
    Hornsby Heights, NSW
    Posts
    419
    Hi Tejinder,

    I thought the locking diff worked like a clutch so it can partially and fully engage, therefore I doubt that it is the sound of gears meshing but can imagine it causing stress on the drive components. As yours should still be under warranty I would take it in to a dealer as soon as possible. Also record the sound and the 4WD display showing the rear locker not dis-engaging. If anything it can avoid the "we couldn't find an issue" situation at the dealers.

    Ron
    2018 TD6 SE Silicon Silver
    2011 TDV6 2.7 Indus Silver - gone
    IIDTool BT

  3. #3
    Join Date
    Dec 2011
    Location
    Forrestfield WA
    Posts
    1,255
    It's highly likely that this is the trnsfer case causing this. It was an issue with L405 Range Rovers and mine had it. You need to change the transfer case oil and recalibrate the transfer case. Of course, it could be the same sort of issue with the rear locker, which is the same sort of clutch system as in the transfer case.

    The symptoms you describe are exactly the same as mine, which was the transfer case. Always when turning at low speeds with slight acceleration or after four wheel driving.

    There were instructions in Topix on what dealers had to do to fix it. That is what my indie followed and it hasn't returned in nearly 80,000km. Mine was at less than 40,000km at the time.
    Bob

    2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
    2013 Range Rover Vogue TDV6
    2017 Disco Sport SE 132kW Ingenium

  4. #4
    Join Date
    Jan 1970
    Location
    Northern Tasmania
    Posts
    133
    I had a very loud clunk from the rear once when accelerating out of a tee junction uphill in the wet. It hasnít done it since, nor have I been in a similar situation since.
    D2a (Sold)
    MY17 D5 SD4 SE (Sold)
    MY19 D5 SD4 SE (with all the options I want)

  5. #5
    Join Date
    Feb 2007
    Location
    Brisbane
    Posts
    4,347
    Maybe the tyres? My Pirelli Scorpion all terrain plus 275/55R20 with 42k on them now cause the diff to clunk on tight, slow corners.

    Quote Originally Posted by Teji_walia View Post
    Hi, I have a D5 MY18 3.0 diesel TD6 equipped with an active rear differential lock and having done 78000kms so far . About 15000 kms back the rear locker would not disengage when turning below 40 kmph and this would produce a lot of noise as if the differential teeth were slipping, something like loud thudding noise. Obviously the transmission is taking some abuse. This happens about 50% of the time. I presume it is some software issue where the rear locker doesnít engage some times. Happens more often when on an incline and the noises are louder. Has anyone else faced this issue? If yes please advise. Thanks in advance.

    Tejinder.
    Disco 5 SD4 HSE 2018
    Disco 4 3.0 SDV6 2014
    Disco 4 2.7 2011
    Disco 3 V6 SE 2007

  6. #6
    Join Date
    Jan 1970
    Location
    Canberra
    Posts
    16,200
    Sounds like the plates in the diff are shuddering - gripping then slipping (like a worn torque converter) - maybe check oil level and type - maybe add a bit of Dr Tranny.
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  7. #7
    Join Date
    Mar 2020
    Location
    Melbourne
    Posts
    2
    Thanks Bob for the information. Could you please send me the document tree of topix or the link thereof where this information is given on how to fix this by recalibration etc.
    Thanks a lot.

  8. #8
    Join Date
    Jan 1970
    Location
    NSW South West Slopes
    Posts
    9,930
    Quote Originally Posted by WhiteD3 View Post
    Maybe the tyres? My Pirelli Scorpion all terrain plus 275/55R20 with 42k on them now cause the diff to clunk on tight, slow corners.
    Tyres could not make the diff clunk - your vehicle has either a TC or rear diff issue.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  9. #9
    Join Date
    Jan 1970
    Location
    Logan
    Posts
    22,845
    Have you tried reversing a short distance to see if it disengages?
    2009 Defender 110 2.4. ARB bulbar, Ironman winch, Safari snorkel, Steinbauer chip, AP HD clutch, Lightforce spots, larger tank, Off Road Systems drawer, Traxide 160 controller, Tekonsha brakes, Mulgo seat runners, Uniden UHF, Nuggetstuff seat corners, breathers, Polaris GPS.

  10. #10
    Join Date
    Apr 2012
    Location
    Greensborough
    Posts
    36

    rear locker

    Quote Originally Posted by Teji_walia View Post
    Hi, I have a D5 MY18 3.0 diesel TD6 equipped with an active rear differential lock and having done 78000kms so far . About 15000 kms back the rear locker would not disengage when turning below 40 kmph and this would produce a lot of noise as if the differential teeth were slipping, something like loud thudding noise. Obviously the transmission is taking some abuse. This happens about 50% of the time. I presume it is some software issue where the rear locker doesnít engage some times. Happens more often when on an incline and the noises are louder. Has anyone else faced this issue? If yes please advise. Thanks in advance.

    Tejinder.
    I have not had any problems with this electric rear diff locker when used off road... probably one thing that hasnt intermittently failed on my D5!

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