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"Notchy" manual transmission after gear oil change

Discussion in '1st Gen. Tacomas (1995-2004)' started by austin1346, Apr 19, 2024.

  1. Apr 19, 2024 at 10:11 PM
    #1
    austin1346

    austin1346 [OP] Member

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    1999 Tacoma 2wd base 5 lug w59 mtm. 250k miles

    I recently drained my transmission and refilled with Redline MT-90 GL4 75w-90 as recommended by a few post I saw here. Ever since then it's been harder to get into gear, noticeably first, and reverse is absolutely awful. It feels like I am hitting a wall partially into first gear on about half of my shifts. On reverse I can hardly ever get into it first try, it used to be 50/50. Now I have to double clutch, go into first, sometimes 5th, and only then will it let me, sometimes it still doesn't and I have to repeat.

    It was filled all the way up to the fill plug, exactly 2.7qts like the manual and hanes book calls for.

    I did more looking online on separate forums and found other people with tacomas reporting the same thing with redline mt90. They said they switched to amsoil and it shifts fine now so I think I will try that. Don't really feel to great about draining brand new $60 worth of gear oil out but can't stand the poor shifting.

    Just wanted to know what you guys think or if anyone has had a similar experience. Thanks
     
    Last edited: Apr 19, 2024
  2. Apr 19, 2024 at 11:05 PM
    #2
    arthur106

    arthur106 Well-Known Member

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    RustyGreen likes this.
  3. Apr 20, 2024 at 5:38 AM
    #3
    pulldo

    pulldo Well-Known Member

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    Yep, that's what I used, loved it, then the last drain and re-fill I couldn't find it, had to go with the Redline, it was a little rougher at first but does OK now. I still liked the Furd stuff mo-betta though.
     
  4. Apr 20, 2024 at 7:01 AM
    #4
    NC Gazzer

    NC Gazzer Well-Known Member

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    How did it shift prior to the change?

    A few months ago, I drained the original oil from my '96 and replaced with MT-90. It shifted perfectly on the 25 year old oil, but I figured that it was about time for new stuff. After replacement, I notice a slight bit of notchiness when the oil is cold, but that goes away once warm. My truck has less than half the miles as yours though.
     
  5. Apr 20, 2024 at 7:12 AM
    #5
    RustyGreen

    RustyGreen A breaker point guy in a Bluetooth world

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  6. Apr 20, 2024 at 8:23 AM
    #6
    0xDEADBEEF

    0xDEADBEEF Trash Aficionado

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    The W59 in mine shifts great with redline MT90
     
  7. Apr 20, 2024 at 11:44 AM
    #7
    austin1346

    austin1346 [OP] Member

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    It shifted just fine. Once in a great while it would be a little difficult to get into first but not even close to how bad it is now.

    Looking like I will switch to the motorcraft xt-m5-qs based on what was said above.

    I'll report back with results.
     
  8. Apr 20, 2024 at 1:17 PM
    #8
    Tuluk

    Tuluk Well-Known Member

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    Please do. I have redline mt90 in mine and first and reverse are bad enough that I keep thinking I need to rebuild the trans. I switched out as soon as I bought the truck so I don’t know what it was like before. Would be interested to know your results.
     
  9. Apr 20, 2024 at 2:09 PM
    #9
    NC Gazzer

    NC Gazzer Well-Known Member

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  10. Apr 20, 2024 at 2:38 PM
    #10
    FixMyTaco

    FixMyTaco Well-Known Member

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    Rebuilding seats with leather from furniture and extra padding. Might put leather on the dash and other interior parts.
    Maybe check your shift lever bushings. Made a big improvement on mine. The big one was totally gone though.
     
    0xDEADBEEF and time623 like this.
  11. Apr 20, 2024 at 8:59 PM
    #11
    time623

    time623 Well-Known Member

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    +1 on all the shift bushings. Mine looked relatively good and I still have a huge improvement in shift feel.
     
  12. Apr 27, 2024 at 1:34 PM
    #12
    austin1346

    austin1346 [OP] Member

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    So I just refilled it with XT-M5-QS and drove around for 30 minutes. It's easier to shift into 1st and 2nd now, and far easier to shift into reverse. It's also considerably easier to downshift which is great. The synchros work much better/faster than before.

    Overall the low speed shifting is improved a lot and isn't nearly as notchy/stiff, no more muscling it into gear. Glad I switched.
     
  13. Apr 27, 2024 at 3:17 PM
    #13
    ChargedSHOTaco

    ChargedSHOTaco Well-Known Member

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    I’ve been using XT-M5-QS for quite some time and my experience has been the same, and I came from using Redline MT-90.
     
  14. Apr 27, 2024 at 4:26 PM
    #14
    Tuluk

    Tuluk Well-Known Member

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    Well thanks for the update. Sounds like it’s about time for me to make a switch and see what it does for me too. Much appreciated feedback!
     
    austin1346[OP] likes this.
  15. Apr 27, 2024 at 6:21 PM
    #15
    time623

    time623 Well-Known Member

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    Damn wish I knew about that, just put in mt90 a few months ago..
     
  16. Apr 27, 2024 at 7:18 PM
    #16
    austin1346

    austin1346 [OP] Member

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    If you have the same issues I described at the top then definitely give it a shot. Pretty easy to do especially since you've done it before.
     
  17. Apr 28, 2024 at 5:43 AM
    #17
    NC Gazzer

    NC Gazzer Well-Known Member

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    Me too. Bummer. At least for me it's not too bad.
     

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