1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Added MT90 Fluid, Now 3rd Gear Grinds

Discussion in '2nd Gen. Tacomas (2005-2015)' started by joelmiller285, Oct 16, 2018.

  1. Oct 17, 2018 at 3:25 PM
    #21
    eon_blue

    eon_blue Most Improved Member

    Joined:
    Mar 4, 2016
    Member:
    #180213
    Messages:
    67,272
    Gender:
    Male
    First Name:
    Ryan
    Vehicle:
    '04 TRD 3.4l 4x4 5sp manual Xtraca & '96 4runner 4x4 5spd manual
    yeah it seems like there are a lot of threads about it where people sing it's praises like it brought their transmission back to life, but I didn't really notice any difference at all. Then again I think my trans is in good health so I suppose there wasn't much to expect except a normal feel.
     
    NAAC3TACO[QUOTED] likes this.
  2. Oct 17, 2018 at 3:33 PM
    #22
    jkulysses

    jkulysses Well-Known Member

    Joined:
    Jun 1, 2012
    Member:
    #79867
    Messages:
    190
    Gender:
    Male
    First Name:
    Jake
    Oregon
    Vehicle:
    01' Tacoma 4x4 3.4l 5 spd
    I switched to mt90 a couple months ago. Before the switch I could barely get the dang thing into first gear especially when cold. After the switch to mt90 it shifts very nice & smooth now but it would sometimes grind on the 1 to 2 shift but never on the 3 to 2. It wasn't consistent either and was driving me nuts. I was wishing I would've bought the mtl fluid but then after driving it for about 500 miles that issue has gone away and it shifts very smooth into every gear. I have a 2.7 with the 5 speed.
     
    NAAC3TACO likes this.
  3. Oct 17, 2018 at 6:19 PM
    #23
    joelmiller285

    joelmiller285 [OP] Member

    Joined:
    Oct 16, 2018
    Member:
    #269578
    Messages:
    12
    Gender:
    Male
    First Name:
    Joel
    Vehicle:
    2006 Tacoma V6, 6 Speed, 4X4
    That's helpful. Maybe I'll give it a few weeks.
     
  4. Oct 20, 2018 at 8:12 PM
    #24
    joes06tacoma

    joes06tacoma Well-Known Member

    Joined:
    Jan 1, 2010
    Member:
    #28588
    Messages:
    3,185
    Gender:
    Male
    First Name:
    Joe
    Central Coast, CA
    Vehicle:
    06 4x4 Off Road Access Cab v6 6spd
    LEER Shell with dome lights operated with 3 way switches, aux backup lights with relay and 3 position switch, modified wiring to compass/temp display and clock to include switch that disables dimming function (poor man's DRL solution), Scan Gauge 2
    Yeah, I'd give it a couple of weeks.

    I put MT90 in mine and it cured an intermittent grind into 4th gear that I was having.

    Never had this happen on the Tacoma, but I have had grinding gears on other vehicles just after a gear oil change, then it worked itself out. I don't understand why, but it was a consistent thing on one of my trucks.
     
    joelmiller285[OP] likes this.
  5. Oct 20, 2018 at 10:50 PM
    #25
    azzwethinkweiz

    azzwethinkweiz Well-Known Member

    Joined:
    Sep 6, 2016
    Member:
    #196623
    Messages:
    964
    Tucson, AZ
    Vehicle:
    2013 4x4 DCSB V6 6-Spd, TRD OR, Tow Package
    I'll put another feather in the hat and say that I've used Motorcraft full synthetic manual trans fluid in my 6 speed and it's worked great. OEM fluid previously was a bit knotchy going into 3rd when cold, switched to the Motorcraft fluid and it's very smooth at all times... cold or hot. Shit is expensive though for Ford fluid lol.
     
  6. Oct 21, 2018 at 4:57 AM
    #26
    buyobuyo

    buyobuyo Read The Fucking Manual

    Joined:
    Jan 24, 2008
    Member:
    #4417
    Messages:
    6,291
    Gender:
    Male
    First Name:
    Jeremy
    Camden, AR
    Vehicle:
    08 PreRunner SR5, I4, Manual, Silver
    A thing or two...
    I used MT90 the first time I changed my transmission fluid because a lot of people rave about it on here. I had the same issues of notchy shifts and clashing gears. I've been using Red Line 75w90NS since and it's a night and day difference.

    @EatSleepTacos
     
    EatSleepTacos likes this.
  7. Oct 21, 2018 at 5:17 AM
    #27
    fla_sun

    fla_sun Well-Known Member

    Joined:
    Oct 15, 2015
    Member:
    #166710
    Messages:
    295
    Gender:
    Male
    Vehicle:
    2006 SR5 4X4 AC 4.0 Auto
  8. Oct 21, 2018 at 6:15 AM
    #28
    azzwethinkweiz

    azzwethinkweiz Well-Known Member

    Joined:
    Sep 6, 2016
    Member:
    #196623
    Messages:
    964
    Tucson, AZ
    Vehicle:
    2013 4x4 DCSB V6 6-Spd, TRD OR, Tow Package
  9. Oct 21, 2018 at 6:17 AM
    #29
    badger

    badger Well-Known Member

    Joined:
    Jan 6, 2012
    Member:
    #70102
    Messages:
    2,128
    Gender:
    Male
    Vehicle:
    07 SR5
    It should be noted that Redline now has a whole suite of manual transmission oils. They used to just have MT-90 and MTL. It might be worthwhile to try some different formulations. Redline still recommends MT-90, but I'm going to give them a call and have a chat.
     
  10. Oct 21, 2018 at 6:22 AM
    #30
    SnowB0und

    SnowB0und Well-Known Member

    Joined:
    Feb 26, 2015
    Member:
    #149635
    Messages:
    121
    Gender:
    Male
    Vehicle:
    4cyl 4x4

    You might try making sure your not over full. I overfilled mine with MT90 and 3rd was notchy. I did it on the street which is a hill so I had about 1/4 qt extra in there. Drained the extra off, shifted like a dream. Also I can’t remember but I think the FSM doesn’t call for fluid dripping out when full I think it was like a 1/4 below the full hole or something like that. You will have to check.
     
    nv529 likes this.
  11. Oct 21, 2018 at 6:29 AM
    #31
    badger

    badger Well-Known Member

    Joined:
    Jan 6, 2012
    Member:
    #70102
    Messages:
    2,128
    Gender:
    Male
    Vehicle:
    07 SR5
    The best way to check oil level is with a piece of wire bent 90 degrees and inserted into the fill hole as a dip stick.I keep a piece of white electrical wire in my truck tool box for that. The end I hold is bent into a ring so no possibility of dropping it inside.
     
  12. Oct 21, 2018 at 6:32 AM
    #32
    DTaco18

    DTaco18 Well-Known Member

    Joined:
    Oct 20, 2018
    Member:
    #270030
    Messages:
    931
    Vehicle:
    2020 TRD SPORT DCSB 6AT MGM
  13. Oct 21, 2018 at 7:01 AM
    #33
    maineah

    maineah Well-Known Member

    Joined:
    Mar 24, 2011
    Member:
    #53641
    Messages:
    6,671
    Gender:
    Male
    First Name:
    Tim
    Maine
    Vehicle:
    4X4 SR5 V6 6spd
    How about API GL-4 or GL-5? synthetic? Only time mine grinds is when I screw up not the trans.
     
  14. Oct 21, 2018 at 9:22 AM
    #34
    Taco'09

    Taco'09 Well-Known Member

    Joined:
    Dec 31, 2008
    Member:
    #12073
    Messages:
    1,838
    Gender:
    Male
    I also tried the Ford "honey" and at first liked its shifting qualities. I got nervous about using it again when I drained the stuff and it came out almost black. So, IDK.
     
  15. Oct 24, 2018 at 8:34 AM
    #35
    joelmiller285

    joelmiller285 [OP] Member

    Joined:
    Oct 16, 2018
    Member:
    #269578
    Messages:
    12
    Gender:
    Male
    First Name:
    Joel
    Vehicle:
    2006 Tacoma V6, 6 Speed, 4X4
    Good info. I had to look up the 75w90NS as I hadn't even heard about it before.

    I think this will be my next step if this MT90 doesn't work itself out.

    Let us know what you find out!

    That's interesting. I didn't know overfilling was possible. I actually jacked up the driver side of the truck slightly to make sure I could get plenty in there, so if overfilling is possible, I did it. I might try parking it on level ground and taking off the fill plug to drain out any excess. The third gear grinding has actually gotten much better, but still happens occasionally when it's cold and i'm not being careful.
     
  16. Oct 24, 2018 at 11:10 AM
    #36
    DTaco18

    DTaco18 Well-Known Member

    Joined:
    Oct 20, 2018
    Member:
    #270030
    Messages:
    931
    Vehicle:
    2020 TRD SPORT DCSB 6AT MGM
  17. Oct 31, 2018 at 8:41 AM
    #37
    joelmiller285

    joelmiller285 [OP] Member

    Joined:
    Oct 16, 2018
    Member:
    #269578
    Messages:
    12
    Gender:
    Male
    First Name:
    Joel
    Vehicle:
    2006 Tacoma V6, 6 Speed, 4X4
    Update:

    I drained just over half a quart of the MT-90, and added some MTL (75w-80) to fill it back up. The shifting is definitely improved, but will still occasionally grind going into third for the first few shifts after a cold start. I think I'm going to give the Ford XT-M5-QS a try next.

    Is a grind in 3rd gear a sign of transmission failure to come? Or could it have this issue for another 100k miles without failing?
     
    nv529 likes this.
  18. Oct 31, 2018 at 10:07 AM
    #38
    Taco'09

    Taco'09 Well-Known Member

    Joined:
    Dec 31, 2008
    Member:
    #12073
    Messages:
    1,838
    Gender:
    Male
    Do not expect the 6-speed to shift well when cold. Its just not its nature.

    If you look around you may find a post or two stating that I have had the RA60F apart and have completely rebuilt a couple now.

    Unfortunately, the 05 and 06 have seen the most problems and the 6-speed has had a multitude of internal part revisions. On yours I might suspect one of the shift forks that was originally cast aluminum, and cracking/breaking (now replaced with steel or cast iron), or the shift keys in the 2-3 slider and hub and sometimes 5th gear as well.

    The springs on the shift keys mentioned like to pop out of the key and get lodged sideways between the hub and slider or even break causing the hard shift. Occasionally 3rd will jam and shifting ends altogether.

    You can try the Ford "honey" noted and if you do not find a significant improvement the matter lies inside.
     
  19. Oct 31, 2018 at 10:35 AM
    #39
    EatSleepTacos

    EatSleepTacos Well-Known Member

    Joined:
    Mar 24, 2015
    Member:
    #151688
    Messages:
    59,677
    Gender:
    Male
    First Name:
    Randy
    West Valley, AZ
    Vehicle:
    2017 4Runner
    My 05 has 185,000 miles on it, and it grinds a little going into third. Been that way since I bought it over a year ago with 168k on it. I wouldn’t worry too much.
     
    yodataco23 likes this.
  20. Oct 31, 2018 at 10:40 AM
    #40
    joelmiller285

    joelmiller285 [OP] Member

    Joined:
    Oct 16, 2018
    Member:
    #269578
    Messages:
    12
    Gender:
    Male
    First Name:
    Joel
    Vehicle:
    2006 Tacoma V6, 6 Speed, 4X4
    That's reassuring. Thanks.
     
    EatSleepTacos[QUOTED] likes this.

Products Discussed in

To Top