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Gear Oil Question - Transmission and Transfer Case - 08' Gen 2 Access Cab, Manual Transmissin, 2.7 L

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TravelingTacoma22, Aug 8, 2022.

  1. Aug 8, 2022 at 3:10 PM
    #1
    TravelingTacoma22

    TravelingTacoma22 [OP] Active Member

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    Hey TW Folks,

    I'm in the process of changing my Front, Rear, and Transfer case oils. I was thinking of investing in tools and doing it myself, rather than a shop. More of a beginner here.

    My truck is a 2008 Taco (info as above), 176k miles on it. I have a question - The dealer has been performing all the fluid changes religiously throughout it's lifetime. They have been using Valvoline 75W90 for everything. I want to change things up to optimize each component, as I have heard Red Line is a great products for manual transmission trucks.

    I was thinking of switching to Red line. I was going to toss 75W-90 (GL-5) in the front/rear diffs, and GT-90 (GL-4) in the transfer case.

    1. Will the overall change from Valvoline to Red line be an issue?
    2. If I change the transfer case fluid, do I have to change the transmission fluid at the same time? and
    3. I was reading that I can use GT-90 (GL-4) in the transmission. Is this correct?


    Thank you in advance for the reply!
     
  2. Aug 8, 2022 at 4:54 PM
    #2
    XSplicer62

    XSplicer62 Well-Known Member

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    1. No issues. Redline has great products.
    2. No, they are separate cases.
    3. That's MT-90, not GT-90. Good stuff to use in Manual Transmissions.

    Be sure to loosen the fill plugs before removing the drain plugs. If a fill plug is frozen in place and you drain the box, you'll have no way to refill it.
     
  3. Aug 8, 2022 at 6:26 PM
    #3
    TravelingTacoma22

    TravelingTacoma22 [OP] Active Member

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    Thanks for the reply XSplicer62! That's what I figured, but just wanted to verify with the group. Yes, I've read over and over to make sure you can unscrew the fill cap first. Imagine being that guy. Like the first guy who started fire, then let it go out by accident. Bummer! Sorry bout the type :)
     
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  4. Aug 9, 2022 at 5:43 AM
    #4
    Hardscrabble

    Hardscrabble Well-Known Member

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    A little of this and a little of that.
    ^^^True and good advice^^^

    Differential and transfer case fluid replacement is a very doable job for the average owner. There’s even some “sticky” threads here on TW.

    Don’t forget about the crush washers.
    https://www.amazon.com/Differential-Highlander-90430-18008-12157-10010-90430-24003/dp/B07Q3R7TWG?crid=FXA9D19KK59&keywords=tacoma+drain+washer&qid=1660048479&sprefix=tacoma+drain+washers%2Caps%2C128&sr=8-12
     
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  5. Aug 9, 2022 at 6:26 AM
    #5
    FishaRnekEd

    FishaRnekEd Well-Known Member

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    might as well change the differential fluid. remember that the diff needs limited slip fluid or additive in the rear
     
    Last edited: Aug 12, 2022
  6. Aug 12, 2022 at 4:33 AM
    #6
    TravelingTacoma22

    TravelingTacoma22 [OP] Active Member

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    Thanks guys! My rear does not have LSD - it's not a TRS or Sport. Called the dealership and checked. Hopefully this lines up with what you've heard in the past.
     
  7. Aug 12, 2022 at 4:55 AM
    #7
    FishaRnekEd

    FishaRnekEd Well-Known Member

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    maybe someone can correct me, but almost every car that drives on asphalt or concrete has a limited slip diff on the main driving end.

    otherwise, the inside tire would peel out and skip every time you turn. something would break eventually

    maybe your truck has some newer technology?

    maybe the person at the dealership doesn't even know what a differential is?

    I'll assume the person on the phone was talking about a locking diff that you don't have. but doesn't even know what that it, just repeating shit like a parrot
     
  8. Aug 12, 2022 at 5:50 AM
    #8
    XSplicer62

    XSplicer62 Well-Known Member

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    Ummm, no. Breakage (and bad handling) could occur with a locked differential on hard surfaces.

    Some differentials are limited-slip, and there are different methods to accomplish that.

    But many are open differentials -- think of a locker when it's not locked.
     
  9. Aug 12, 2022 at 5:51 AM
    #9
    Dm93

    Dm93 Test Don't Guess

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    Many non performance vehicles have open differentials (ie no limited slip), to my knowledge only 05-08 TRD Sport models had a limited slip diff. TRD OffRoad models have a selectable locker that mechanically locks the differential, 09-15 trucks have a simulated limited slip selected with the VSC button that uses the ABS system to apply the brake at the wheel that is slipping.

    Most factory limited slip differentials have clutches in them that apply when there is a torque difference between the left and right axle thus requiring friction modifiers to prevent chatter.

    All that being said many quality gear oils for differentials already have the friction modifier added, they typically say "formulated for limited slip axles" or "no friction modifier required"
     
  10. Aug 12, 2022 at 6:04 AM
    #10
    netman86

    netman86 Well-Known Member

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    MOST vehicles have an open differential. what you're describing is a locked differential- some off road racing people will weld theirs together to lock them, a limited slip allows them to move at different rates (turning) but also will force them to both move if one is in a free-spin (snow, mud, etc)
    In my experience, limited slips are rare, expensive, newfangled things. Locked diffs are offroad racing, open diffs are the norm.
     
  11. Aug 12, 2022 at 3:04 PM
    #11
    TravelingTacoma22

    TravelingTacoma22 [OP] Active Member

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    I think I'm following with you guys. And yes, the mechanic was pretty certain that mind does NOT have a limited slip differential. It's nothing fancy, 2008, manual transmission, 2.7 L engine. No aftermarket stuff. So I'm assuming that there is NO LSD on it.
    - Follow up question. Yes, Redline gear oil that I picked up states "75-W-90, NS". The NS, is obviously for Non Slip. So I assume this gear oil is OK to use in an open, or NON LSD, correct?

    Thanks again for taking the time to bounce this dialogue off, I appreciate it.
     
  12. Aug 12, 2022 at 4:32 PM
    #12
    Dm93

    Dm93 Test Don't Guess

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    The 75W-90 NS is for manual transmissions/transaxles, you want the 75W-90 GL5 for the differentials.
    If you put in your vehicle info on redlines website it will show you the correct oils for your truck.
     
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  13. Aug 12, 2022 at 4:54 PM
    #13
    TravelingTacoma22

    TravelingTacoma22 [OP] Active Member

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    I feel like an idiot. I've been researching all this time, when I could've just look up the compatability on their website. Thank you! This makes things much easier!
     
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  14. Aug 12, 2022 at 4:57 PM
    #14
    Dm93

    Dm93 Test Don't Guess

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    :thumbsup:
     
  15. Aug 12, 2022 at 5:02 PM
    #15
    XSplicer62

    XSplicer62 Well-Known Member

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    Yes, yes, and yes. Very helpful post. :thumbsup:
     

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