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Yes, more gear oil talk..

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Ross137, Dec 5, 2008.

  1. Dec 5, 2008 at 7:30 AM
    #1
    Ross137

    Ross137 [OP] Member

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    Anoka, MN
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    05 Tacoma 4x4 Trd Sport
    Ok, ok, I know this topic as been beaten to death so I thought I'd post a quick summary of what I read for the past week with a few extra questions. I'm most concerned with the LSD on the Sport because that is what I have. I was going to get what the dealer put in but they only had it in a barrel not a quart. This led me to the long frustrating search on gear oil for the LSD.

    ***PLEASE correct me if I'm wrong here as I have only read many threads and have not preformed this oil change yet.

    Tacomas 2005-2009 Off-Road
    FRONT
    -Any synthetic gear oil for front & t-case will work fine.
    REAR (has locker)
    -Any synthetic gear oil for rear locker will work fine.

    Tacomas 2005-2008 Sports (2009 has electronic LSD):
    FRONT
    -Any synthetic gear oil for front & t-case will work fine.
    REAR (Mechanical LSD)
    -Mobil 1 synthetic 75W-90: problems with chattering. Some LSD ok with 2 bottles of LSD friction modifier.
    -Redline synthetic 75W-90: Ok??
    -Royal Purple synthetic 75W-90 - Ok at first, but will chatter eventually
    -Blend of synthetic/conventional 80w-90- Ok??
    -Any conventional (dino) 80W-90 - Haven't read any issues.

    Questions:
    1) For those that have had used conventional oil, did you have to add a friction modifier even if the gear oil said it was ok with conventional and limited slip differentials?
    2) What is the best conventional oil for the LSD. I've read Castrol Hypoy C is pretty good.
    3) If you did you an additive and have had success, which additive did you add?

    Thanks for reading! I'd like to have all my gear oils soon since I'm at 35k :anonymous:
     
  2. Dec 5, 2008 at 8:21 AM
    #2
    spaghettiedy

    spaghettiedy Well-Known Member

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    This is the same info that I gathered, and other forum members were taking there trucks into the stealership for the rear mech-LSD. I would get the rear LSD gear oil from the dealership just to be on the safe side.

    What is everyone using for 2009 that have electronic-LSD? I know that its a lighter weight than previous years.
     
  3. Dec 5, 2008 at 8:32 AM
    #3
    Demoncleaner

    Demoncleaner Well-Known Member

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    TRD exhaust Homemade bed mat & bed extender, front Drings, Short clutch throw, Summer: Stock 17's Winter: Blizzaks on 16' black steelies
    I have same the truck, run syn everywhere but LSD. Have used cheap off the shelf dino and also synblend 80w-90 that was for LSD applications. No modifier. NO problems with either.
     
  4. Dec 5, 2008 at 8:34 AM
    #4
    Joe B

    Joe B Well-Known Member

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    I'm using Amsoil Severe Gear 75w90 in Diffs and transfer case.
    No extra friction modifier need with the elec LSD.
    No issues.:)
     
  5. Dec 5, 2008 at 8:54 AM
    #5
    OU812

    OU812 ban the term murdered out

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    I use Castrol 80/90 Hypoy C / API spec GL-5 with a small bottle of friction additive from Carquest.
    Been working just fine with zero chatter.
     
  6. Dec 5, 2008 at 9:39 AM
    #6
    Ross137

    Ross137 [OP] Member

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    What was the reason for adding the friction additive to this gear oil? Dosen't the Castrol bottle say it can be used for limitied slip without any additional additives?
     
  7. Dec 5, 2008 at 9:42 AM
    #7
    Joe B

    Joe B Well-Known Member

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    Sometimes you still have to add friction modifier.
    Can't hurt to add a bottle anyway.
     
  8. Dec 5, 2008 at 10:52 AM
    #8
    OU812

    OU812 ban the term murdered out

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    Nothing yet, brand new!
    Exactly
     
  9. Dec 5, 2008 at 1:17 PM
    #9
    Ross137

    Ross137 [OP] Member

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    Thanks for the replies!

    Has anyone had success with RedLine synthetic 75W-90 for the LSD? If so, did you use the additive too?
     
  10. Dec 5, 2008 at 4:51 PM
    #10
    Gerry Pope

    Gerry Pope Well-Known Member

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    Ross,
    I used Redline 75W90 in both diffs. for my 07 4X4 Sport.. No friction mod. needed as the Redline comes with it mixed in. I did not have any issues with rear end chattering. I put Redline MTS in my 6-Speed tranny as well. I did have a problem with 3rd gear not going in smoothly and the MTS fixed that. Overall very happy with Redline..
     
  11. Dec 6, 2008 at 11:31 AM
    #11
    Ross137

    Ross137 [OP] Member

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    Gerry, how many miles have you put on since the diffs were changed with Redline?
     
  12. Dec 6, 2008 at 5:45 PM
    #12
    Gerry Pope

    Gerry Pope Well-Known Member

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    Ross,
    I have put on 460 miles since changing all fluids.. I have not had any chattering at all. Like I said earlier I am very pleased with the way the Redline MTS has smoothed out 3rd gear. I did notice an improvement in mpg. Was getting 13-14 mpg and now I am getting 15-16.. I have 17600 miles on the truck..
     
  13. Dec 7, 2008 at 6:28 AM
    #13
    Ross137

    Ross137 [OP] Member

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    Thanks for the reply. The reason I ask is because one person on this site said that the chattering showed up 20k miles after the synthetic change. I suppose it's getting close to change the diff by that time anyways.
     
  14. Dec 7, 2008 at 5:02 PM
    #14
    Gerry Pope

    Gerry Pope Well-Known Member

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    I wouldn't get too upset after 20K... Like you said it's gettin close to change again anyhoo..
     
  15. Dec 15, 2008 at 11:44 AM
    #15
    Ross137

    Ross137 [OP] Member

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    Well, I finally changed my rear/front diff & t-case this weekend. Thanks for all the input. Here's what I put in and some suggestions for others doing this oil change.

    Front Diff: Mobile 1 75W-90
    T-Case: Mobile 1 75W-90
    Rear Diff: Valvoline 80w-90 + 7 oz. tube of Friction modifier

    I couldn’t believe it was about $12 for new washers! You might be able to reuse the front diff drain copper washer and the drain/fill t-case washers since they’re not really ‘crush’ washers like the others. I picked up a hand pump too but the tube didn’t reach the bottom of the oil bottle. Plus, the pump had an inch or so of travel so it took FOREVER to fill the rear. I must have picked up the wrong type of pump.

    Rear Diff: I added the LSD friction modifier because I think even though the bottle says “for conventional and limited slip” it doesn’t mean it has the friction additives like RP and others has on the bottle. The magnet on the drain plug did have a lot of goo/metal shavings. I had only picked up 3 qts of Valvoline, but couldn’t pump the entire 3qts in since the pump tube was too short. I added a few pumps of the mobile 1 to top it off. Should be fine. After I changed this I did the 8 right/8 left tight turns in a parking lot to mix it up. Nice and smooth.

    Front Diff: Probably the hardest due to the tight space under there. Drain plug also had a lot of goo/metal shavings attached to the magnet. Why didn’t Toyota use the same 24mm socket for these plugs??

    T-Case: Oil looked pretty good. I’ve heard this oil doesn’t get that dirty anyways.

    Next time:
    Reuse some of the washers that weren’t crush washers, get more oil than I need and get another drain pan so I can drain both front and rear to save time.
     
  16. Dec 15, 2008 at 11:50 AM
    #16
    genxer36

    genxer36 Lord of Tomfoolery

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    The dealer told me:

    LSD you should use synthetic.

    No LSD use dino.
     
  17. Dec 15, 2008 at 12:18 PM
    #17
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    dealers will tell ya anything man.:rolleyes:

    i have synthetic in my rear(locker) and front diff's and transfer case..........shifts into 4 wheel drive alot smoother.
     
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