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Manual Tranny Gear Oil recommendations

Discussion in 'Technical Chat' started by srsupertrap, Jan 13, 2010.

  1. Jan 13, 2010 at 8:23 PM
    #1
    srsupertrap

    srsupertrap [OP] Well-Known Member

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    2001 Tacoma SR5 V-6 TRD 4 X 4
    Bilstein 5100s, Borla 14945 S/S Exhaust, Fram Air Hog Filter, Diff Breather Mod & NGK Wires
    Goinging to change out all the manual trans & Differential gear oil on my 2001 Tacoma TRD 4X4 which has 112K on it and rear differential lock. The Service manual specifies the following grades & quantities

    Transmission: API GL-4 or GL-5 75W-90 (2.6 Quarts)
    Transfer Case: API GL-4 or GL-5 75W-90 (1.1 Quarts)
    Front Differential: Hypoid API GL-5 75W-90 (1.2 Quarts)
    Rear Differential: Hypoid API GL-5 80W-90 (3.2 Quarts)

    What do you guys recommend? Looks like I need 2 gallons so the synthetic route would be pretty expensive considering Mobil 75W-90 is about $10 quart.

    TIA
     
  2. Jan 13, 2010 at 8:30 PM
    #2
    Coupe

    Coupe Well-Known Member

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    Lots baby!
    I used Mobil 1 for the rear end. Royal purple for the trans. I am RWD, so no transfer case.
     
  3. Jan 13, 2010 at 8:44 PM
    #3
    SC4333

    SC4333 Well-Known Member

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    Grant
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    SOLD!
    I would stick with good old conventional for the transmission. If you read around, you'll notice a lot of people having issues with 1-2 shifts after changing out the trans oil to synthetic.

    Personally, I changed the oil in mine about 2k back and went from the conv. toyota gear oil to Valvoline SynPower. It is a great oil, and has all the certifications you could ask for... API MT-1, API GL-5, MIL-PRF-2105E < Mil-Spec, SAE J2360, and Mack GO-J but still performs like shit in these transmissions. The 1-2 shift just feels terrible. On a cold morning, it will take a good two seconds to even drop into second gear, while many times getting a little grind to it.

    Bottom line is, if you change you oil out on any kind of a regular basis, there is absolutely no advantage to synthetic over conventional oil other than in the most extreme of conditions. Even there, you have a high probability of that transmission outliving the rest of your ride.
     
  4. Jan 13, 2010 at 9:01 PM
    #4
    topgun155

    topgun155 Well-Known Member

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    I would stick with the OEM toyota oil. We all know it works well.
     
  5. Jan 14, 2010 at 5:53 AM
    #5
    srsupertrap

    srsupertrap [OP] Well-Known Member

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    2001 Tacoma SR5 V-6 TRD 4 X 4
    Bilstein 5100s, Borla 14945 S/S Exhaust, Fram Air Hog Filter, Diff Breather Mod & NGK Wires
    Well I guess we share the same symptom of the 1-2 shift is notchy at best and just plain crappy most of the time. I was thinking synthetic might make that symptom go away.

    Thanks for the back ground and edmucation :)
     
  6. Jan 14, 2010 at 6:02 AM
    #6
    Coupe

    Coupe Well-Known Member

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    Lots baby!
    I had good luck with the synthetics making the shifts a little smoother.
     
  7. Jan 14, 2010 at 6:04 AM
    #7
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    Amsoil or Mobil 1. I used Amsoil in my 98 without issue. I have heard good things (no negative) about Mobil 1 also.
     
  8. Jan 15, 2010 at 8:22 PM
    #8
    68vert

    68vert Well-Known Member

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    I used Royal Purple and have the typical problems (1-2 shifts, notchy) but only when really cold and it goes away after truck warms up.
     
  9. Jan 15, 2010 at 8:24 PM
    #9
    drew02a

    drew02a Rocking your mom's world Since 1997

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    I use RedLine 75w 90 in all of them. Jegs has the best price on it as far as I know.
     
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