Front & Rear Diff Issues + Fluid Changes
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Thread: Front & Rear Diff Issues + Fluid Changes

  1. #1
    Premium Member Frisco_TX_RRS's Avatar
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    Front & Rear Diff Issues + Fluid Changes

    I had my Front and rear diff fulids replaced last month, where I had a sample of each extracted and sent for analysis. Report came back with a very high level of Iron meaing that there was excessive wear.

    Front diff had double the rate of Iron than the rear. Is there any bulletin regarding abnormal wear on the diffrentials and potential issues.

    Had sent a sample of the Transfer case oil too, but that that was misplaced - so no idea what the reading of that was. The differential oils were thick and black; thick being ok since its a 75w90 oil; being that it's a gear oil, it should not be black at 50k+ miles - I would recommend folks to change this sooner than the suggested mileage.

    Feel like having a magnet attached to the bottom of the diffrential to attract the iron particles as they come off so they don't recirculate causing more wear.
    2006 RRS HSE |Java Black | DFW-TX

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  3. #2
    Premium Member gooseyloosey's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Re diff oil. I've gotten into a habit of changing it first at 30K and the transfer case at 60K. 30/60 is easy to remember for me. I need to get mine done in the next month or so.

    Does the RRS have a magnetic drain plug--I guess not? If not, you can probably buy an aftermkt one. http://www.lislecorp.com/oem_mag_plugs.cfm

    Also, diff oil in all my cars is always dark, even @30K, so that's normal.



    Last edited by gooseyloosey; December 18th, 2013 at 07:58 PM. Reason: clarified change interval
    '08 RRS HSE Stornoway Gray

    Space isn't remote at all. It's only an hour's drive away if your car could go straight upwards.

  4. #3
    JUNIOR ROVER
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    re: Front & Rear Diff Issues + Fluid Changes

    Frisco.

    Sounds normal if your truck is near new, as these components have to 'bed-in' before tolerances are met and don't be worried on the centre differential, as this unit is the torque proportioning Torsen worm gear type since the RRS was introduced new !

    I've replaced all fluids in my Rangie except trans/brakes - with "Redline" fully synthetic products and the response is noticeable.

    Keep an ear out for strange drive train noises or increased fuel consumption rates in future, as these are problem indicators ?

    Cheerio,


    Vinniman
    '88 Highline
    Perth, W.A.

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  6. #4
    FRESHMAN ROVER
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    re: Front & Rear Diff Issues + Fluid Changes

    Maybe it's this: Special Service Message, # SSM34304

    Models
    LM - New Range Rover
    LA - Discovery 3
    LS - Range Rover Sport

    Title Front & Rear Differential Noise & Oil Leaks
    Last Modified 03-MAR-2009 12:23
    Category: Driveline
    Symptom: 509000 Axle Concerns
    Content: Front & Rear Differential Noise, Minor Oil Seal Leak & Debris in Oil.

    Concern: Noise (Whine or humming) from the front or rear differential. A minor oil leak may be evident with possible debris in oil. Oil will be black in color.

    Cause: The casing black paint /sealer degrades, detaches and contaminates the oil.
    This results in the oil overheating which results in oil seal leaks and bearing noise.
    Note: Differentials from the VINs quoted below are manufactured with a new casing paint which overcomes the above mentioned issues.

    Please only raise an EPQR for differential issues which occur post the quoted VIN numbers:

    Discovery 3 LR3 - LA8A459201
    Range Rover Sport - LS8A141510
    Range Rover. LM8A268394
    '07 RRS
    Luxury & Winter Package
    Java Black Exterior / Ivory Interior
    Rock Sliders by Rover Specialists
    Green Oval Experience Front Bash Plate
    Johnson Rods (just for play time)
    IID Tool
    BF Goodrich AT KO2 265/65/18
    RotoPax Storage & Liquid Containers
    Baja Roof Rack
    Maxtrax
    Front Runner Wolf Packs

  7. #5
    Premium Member Frisco_TX_RRS's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Sorry for the delayed response - thanks for all your input.

    Goosey - I lke maintaining my vehicles through the life - will take your advice and do as you've recommended. I don't think the drain plug is magentic. I've glued magnets on the oilpan of my Mercedes, which I will do on the RRS as well.


    Vinniman - the vehicle is not that new. Its an 06, but this is the 1st change in diff fluids. Will do another test after 30K to see. MPG's are staying constant as of now.

    Mark511 - There has not been any noise that I can hear. Will keep a look out for this.

    Thanks again guys.
    2006 RRS HSE |Java Black | DFW-TX

  8. #6
    Premium Member gooseyloosey's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Quote Originally Posted by Frisco_TX_RRS
    I don't think the drain plug is magentic. I've glued magnets on the oilpan of my Mercedes, which I will do on the RRS as well.
    Thanks Frisco.

    Can anyone confirm that the differential drain plugs are not magnetic to save me a trip to the LR dealer to check? I'd call but I don't necessarily trust the parts counter guy.

    I have discovered that the Mazda Miata differential drain plug is the same size as the Sport (M14x1.5) and its magnetic. I think I will stop by the Mazda dealer on the way home and pick a couple up for when I change the diff oil next week. This will be a nice upgrade if it fits.

    Also, I am assuming the front and rear diff drain plugs are the same size?



    '08 RRS HSE Stornoway Gray

    Space isn't remote at all. It's only an hour's drive away if your car could go straight upwards.

  9. #7
    Premium Member gooseyloosey's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    One more question...

    If I don't have the electronic rear locking differential I can use the same diff oil front and back?

    There are two LR part numbers for diff fluid LRN 7591 and 500070. The 500070 is for the rear diff but I am thinking this is used if you have the rear locker option. Which AFAIK I don't have.



    '08 RRS HSE Stornoway Gray

    Space isn't remote at all. It's only an hour's drive away if your car could go straight upwards.

  10. #8
    LIFETIME CONTRIBUTOR umbertob's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Here is the info I collected from the shop manual. Applies to MY2006 through 2009 only.

    1. No info on drain plugs (magnetic or not), since the shop manual doesn't specifically state so I assume they are non-magnetic? They should be the same front and rear, but see the note on differential numbers and different styles of plugs used below.

    2. Front diff lubricant and capacity: Castrol SAF-XO 75W/90, 0.61 liters (0.64 US Quarts) *

    3. Rear diff lubricant and capacity: OPEN DIFFERENTIAL: Castrol SAF-XO 75W/90 (same as front diff), 1.1 liters (1.16 Qts.) *

    4. Rear diff lubricant and capacity: LOCKING ELECTRONIC DIFFERENTIAL: Castrol SAF Carbon Mod Plus, 1.5 liters (1.60 Qts.) *

    * Manual states these are dry capacities and slightly less may be needed when refilling due to some residual oil retained in the pinion housing. See point 8 below and good luck with that estimate...
    Suggesting you carefully measure the quantity of drained fluid before you discard it, and refill with the exact same quantity of fresh lubricant.

    5. Torque for front differential drain plug:
    CAUTION: There have been 2 different types of fixings used for the drain plug. Note the type and differential serial number, and make sure the correct torque is applied:
    Up to differential serial number 254845: Tighten the hexagonal drive drain plug to 54 Nm (40 lb.ft).
    From differential serial number 254846: Tighten the 3/8'' square drive drain plug to 28 Nm (21 lb.ft).

    6. Torque for rear differential drain plug:
    CAUTION: There have been 2 different types of fixings used for the drain plug. Note the type and make sure the correct torque is applied:
    Up to differential serial number 254325: Tighten the hexagonal drive drain plug to 54 Nm (40 lb.ft).
    From differential serial number 254326: Tighten the 3/8'' square drive drain plug to 28 Nm (21 lb.ft).

    7. Torque for filler plug (both front and rear diff): 34 Nm (25 lb.ft).

    8. CAUTION: Do not fill either front or rear differential with lubricant up to the filler plug. The filler plug is only used to fill the differential with lubricant, and not to act as a level indicator.
    The only way to check the fluid level in the differential is to drain all the fluid out and refill with the correct quantity, shown in the above specs.

    9. Wash your hands thoroughly. J/K.

    Front diff filler and drain plug locations:
    Front & Rear Diff Issues + Fluid Changes-filler-plug-front-diff.jpgFront & Rear Diff Issues + Fluid Changes-drain-plug-front-diff.jpg

    Rear diff filler and drain plug locations:
    Front & Rear Diff Issues + Fluid Changes-filler-plug-rear-diff.jpgFront & Rear Diff Issues + Fluid Changes-drain-plug-rear-diff.jpg


    How to tell an open vs locking rear diff... Slide under the car and look for the actuator on the differential case, should be easy to spot:
    Front & Rear Diff Issues + Fluid Changes-rear-diff-open-locking.jpg
    A - Electronic rear differential
    B - Open rear differential
    1 - Rear driveshaft
    2 - Electronic rear differential
    3 - RH rear drive halfshaft
    4 - Actuator (locking) motor assembly
    5 - LH rear drive halfshaft
    6 - Rear differential
    Last edited by umbertob; May 19th, 2013 at 09:18 AM.

  11. #9
    Premium Member gooseyloosey's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Umberto, thanks for this good info. Especially since the common way to refill a differential is to go until it drains out the fill hole, but we have to be different at LR don't we?



    '08 RRS HSE Stornoway Gray

    Space isn't remote at all. It's only an hour's drive away if your car could go straight upwards.

  12. #10
    Premium Member gooseyloosey's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Just fyi.

    I wanted to use the spec'd oil since I am still under warranty. The Castrol SAF-XO 75W/90 in Umberto's post is not readily available in the US. But I was pleasantly surprised that 3 qts of the LRN7591 (which is Castrol SAF-XO 75W/90) from my local LR dealer was only $27, actually cheaper than synthetic Mobil 1 75W-90. So I picked some up last eve and I'm having this done at an independent shop next week.



    '08 RRS HSE Stornoway Gray

    Space isn't remote at all. It's only an hour's drive away if your car could go straight upwards.

  13. #11
    Premium Member Frisco_TX_RRS's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Goosey, do let me know when you remove the LR plugs if you see metal fragments attaracted to it and if the Miata plugs fits there - but I doubt it. There is a magnet you can buy that gets adhered with adhesive that holds up to hight heat. Will try and get you the details when I find it.

    Also, if you decide to drain, and want it tested, you can use my staveley account. Curious to see what these tests come back with in comparison to mine. Bought 3oz liquid proof bottles from the Container store.
    2006 RRS HSE |Java Black | DFW-TX

  14. #12
    Moderator RRToadHall's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Umberto, that is an excellent writeup. Have you sent it to John for inclusion on home page?
    "The power of good is always stronger than the power of non-good.
    The power of light is stronger than the power of darkness,
    the power of knowledge is stronger than the power of ignorance."
    ~ Maharishi Mahesh Yogi~

  15. #13
    Premium Member gooseyloosey's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Umberto, yes can we sticky this and the brakes? Or are there issues w LR?

    Frisco, I left him instructions to check the plugs to see if they're magnetic.

    I will also leave him one Miata plug. I'll have it put in the rear diff if it fits. The local Mazda dealer has one, I just have to find the time to pick one up before Wed.

    Thanks for the offer on the oil analysis. I have the feeling we'll find high iron on an analysis, especially with the first drain. The ones I have done myself in the past with magnetic drain plugs have always had a sludgy "beard" of iron on them.



    '08 RRS HSE Stornoway Gray

    Space isn't remote at all. It's only an hour's drive away if your car could go straight upwards.

  16. #14
    LIFETIME CONTRIBUTOR umbertob's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Quote Originally Posted by gooseyloosey
    Umberto, yes can we sticky this and the brakes? Or are there issues w LR?
    Stuck both threads to the RRS' FAQ. The brakes thread won't be complete until you post your step-by-step instructions (with pictures), though.

  17. #15
    Premium Member gooseyloosey's Avatar
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    re: Front & Rear Diff Issues + Fluid Changes

    Thanks Umberto! I guess now that warranties are coming off the 1st generation, we'll prolly see more repair questions come up.

    Just like the P-38 board



    '08 RRS HSE Stornoway Gray

    Space isn't remote at all. It's only an hour's drive away if your car could go straight upwards.

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