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Rear, Front Diff's and Transfer Case Oil

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TBauer, Oct 9, 2019.

  1. Oct 9, 2019 at 8:37 AM
    #1
    TBauer

    TBauer [OP] New Member

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    Hi, new to the forum. Amateur DIY mechanic. I'm doing my diff's and transfer oils. I bought 75w-90 with a friction mod mixed in already (Valvoline 75w-90 high performance gear oil). Will the modifier hurt my transfer case?

    On a side question, is a friction modifier needed? I have contacted my dealer and they told me they DO add it to their services. Toyota has told me that it is not recommended in the manual so they wont recommend it. I do get a lot of conflicting information on this topic, anywhere I read. I would appreciate a clear cut yes or no and reason (if this is at all possible).

    Thanks everyone.
     
  2. Oct 9, 2019 at 8:45 AM
    #2
    NAAC3TACO

    NAAC3TACO Middle aged member

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    Color matched door handles, Weathertech floor liners, bed mat, Durafit seat covers, tailgate clamp, 2016 TRD Sport 17" wheels with Yokohama Geolander AT tires , Toyota exhaust tip, Toyota/Yakima bike rail mount, Toyota wheel locks, Toyota hitch cover, Redline hood struts, unifilter on air pump.
    Only 2005-2008 TRD Sports need the modifier, however the modifier will not hurt your diffs or tcase. I just used the same oils in my 2014.
     
    QChawks, DavesTaco68 and SR-71A like this.
  3. Oct 9, 2019 at 8:49 AM
    #3
    SR-71A

    SR-71A Define "Well-Known Member"

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    Yup. Used the same excat oil for my 60k service (now at 70k) and nothing has exploded yet :D

    Friction modifiers are for mechanical limited slip diffs. But works fine in 'normal' applications as well
     
  4. Oct 9, 2019 at 8:50 AM
    #4
    TBauer

    TBauer [OP] New Member

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    Thank you. What is the reasoning I don't need the modifier? I do have a LSD, I have a hard time understating this as well.
     
  5. Oct 9, 2019 at 8:55 AM
    #5
    SR-71A

    SR-71A Define "Well-Known Member"

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    It was my understanding that early year Sports had LSDs. Other models / years either had a standard open differential, or the e-locker. I have seen a bunch of conflicting info on this topic though.

    Either way, you should be covered.
     
  6. Oct 9, 2019 at 8:56 AM
    #6
    NAAC3TACO

    NAAC3TACO Middle aged member

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    Yours is not mechanical, it uses the abs system instead.
     
  7. Oct 9, 2019 at 9:01 AM
    #7
    Kevinztaco

    Kevinztaco Well-Known Member

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    After reading a few posts, I felt like I became more confused as to which brand of gear oil I should or should not use so I stopped reading. I looked at the owners manual and went to the local auto parts stores and settled with these. I have not heard any explosions from underneath yet either.

    07F0DBEE-D6DD-4FB3-97FB-B09328C4C0DA.jpg
     
  8. Oct 9, 2019 at 9:07 AM
    #8
    Black DOG Lila

    Black DOG Lila Well-Known Member

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    Stock. EZ pass.Dump pass.Inspection sticker.Convict printed lic.plates.FG cap.
    I changed mine yesterday. Owners manual called for 7qt. total for both diffs, transmission and transfer case. It actually took 8 1/2 qt. I used Valvoline HP buy one get second 1/2 price. Cheap ass pump took over 200 pumps.
     
  9. Oct 9, 2019 at 9:07 AM
    #9
    NAAC3TACO

    NAAC3TACO Middle aged member

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    Color matched door handles, Weathertech floor liners, bed mat, Durafit seat covers, tailgate clamp, 2016 TRD Sport 17" wheels with Yokohama Geolander AT tires , Toyota exhaust tip, Toyota/Yakima bike rail mount, Toyota wheel locks, Toyota hitch cover, Redline hood struts, unifilter on air pump.
    Those are fine. If your Sport is 2009 or newer, you don’t need the additive.
     
  10. Oct 9, 2019 at 9:10 AM
    #10
    NAAC3TACO

    NAAC3TACO Middle aged member

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    Just east of crazy, NV
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    2014 SR5 DCLB 4x4
    Color matched door handles, Weathertech floor liners, bed mat, Durafit seat covers, tailgate clamp, 2016 TRD Sport 17" wheels with Yokohama Geolander AT tires , Toyota exhaust tip, Toyota/Yakima bike rail mount, Toyota wheel locks, Toyota hitch cover, Redline hood struts, unifilter on air pump.
    I only use the pump on the front diff. On the rear and tcase I attach a short clear tube and squeeze the oil in. There is plenty of room especially if you drop the spare tire.
     
  11. Oct 9, 2019 at 9:14 AM
    #11
    Black DOG Lila

    Black DOG Lila Well-Known Member

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    Stock. EZ pass.Dump pass.Inspection sticker.Convict printed lic.plates.FG cap.
    I used to do that till I wore a quart.
     
    llamasmurf and NAAC3TACO[QUOTED] like this.
  12. Oct 9, 2019 at 12:25 PM
    #12
    muddog321

    muddog321 Well-Known Member

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    09 Tacoma DCSB 4wd TRD Off-Road w/e-locker Pyrite Mica
    TW 1-piece driveshaft with 1310 u-joints All Pro and Budbuilt skid plates OME Dakar rear springs 3" with 5100 5100 front set at 1.75" (3rd groove up) with stock springs Falken Wildpeak A/T3W 265/70R16 2018 TRD Offroad wheels 16x7J with +25mm offset Powerstop rotors with Z36 pads and rebuilt with OEM caliper kit Complete rebuilt rear brakes drums, shoes, springs, wheel cylinders Rebuilt rear diff with Yukon 3.73 ring/pinion Denso 130A rebuilt alternator AGM 24F Battery New OEM idlers and tensioner assembly New AC compressor New PS hose and flushed Walker SS Quiet Flow muffler Denso Iridium long life plugs #3421 (SK20HR11) OEM coolant, cap, and thermostat NAPA CV axles and new seals ECGS bushing Rhino front guard Shortened mud flaps Alziria Black Tail Lights Nilight Headlights X-Bull Traction Boards Maaco full single stage paint job 2023 Nat CV to Knuckle seals 710573 New SKF wheel bearings/hubs BR930978 New Moog stabilizer links K80946 & 948 New Dorman rear wheel bearings using complete axles 926-139 & 140
    I used Mobile 1 in them 75-90.
    Yes starting in 2009 no real LSD or posi unit in Tacomas. When a rear wheel starts to slip the ABS fires and the engine management can ramp your throttle down too. Only the TRD Off-road models can truly lock the rears together in 4Lo (the e-locker). Other models, even TRD sports, do not have this capability. NO Tacoma has any true LSD/posi anymore you have go aftermarket. They cheaped out as most buyers have no clue what real limited slip diff was and with traction control they can tie it all together in the ECU to handle (somewhat).
    Ever see a 2009 and up Tacoma (without e-locker) try and pull a stomp or big load out when slippery you hear the ABS firing and the engine ramp down! On the Off-road with the e-locker engaged in 4Lo it actually shuts off the ABS, engine management and ATACS (traction control) as all the dash lights come on.
     
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