Manual tranny oil
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This is a discussion on Manual tranny oil within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; okay sometimes when i shift from 1st to 2nd it is smooth but sometimes it's clunky and as a result ...

  1. #1
    Registered User ***biGRed***'s Avatar
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    Manual tranny oil

    okay sometimes when i shift from 1st to 2nd it is smooth but sometimes it's clunky and as a result i grind into second. i checked my tranny oil and it's on the low side. could this be the reason that the 1st to 2nd shift isn't smooth? every other gear shifts smooth except for this 1-2 shift.

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  3. #2
    MisterX's Avatar
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    Try this thread because there is some good infoormation on many diffetent gear oils.

    Russ

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    Moderator GV27's Avatar
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    Check the Technical Reference Sticky in the Powertrain forum for several gear oil threads, including the one Mr. X referenced.

    Chris
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
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  5. #4
    Registered User ***biGRed***'s Avatar
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    after reading all that i'm still lost as to which brand i should get. i don't even know where the hell the drain plug is?!!!!!

  6. #5
    Moderator GV27's Avatar
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    The man wants a definitive answer. I don't think one exists. I would probably start by trying M1 if I were you. No particular reason other than it's good stuff, fits the specs and is easy to obtain.
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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    definitive answer would be to use non synthetic GL5 75W90 gear lube without friction modifiers, as for limited slip differentials.
    This will provide a good shift feel.
    The problem with Mobil Gear Lube is that it is synthetic and during the winter months it is so slippery that till the tranny gets any heat in it, it is almost impossible to shift out of 1st and into 2nd without some grinding of the dog gears.
    Redline MT90 addresses this for transaxles, but it is a GL4 lube.
    Bottom line is if you want a simple answer go with original fluid,
    if you work the car a bit then a 50/50 mixture of Mobil 1 and Red Line MT90 works better than straight Mobil 1, at least in my car.
    Then again if you live in a warm climate straight Mobil 1 works fine as well.
    BTW, the grain plug is ~22M and smack under the transaxle.

  8. #7
    Banned dark_rex's Avatar
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    the only dog gear in the rex is reverse.

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    maybe we are using different terms, the dog gear is what the synchros persuade to engage the actual gear. So when you "clash the gears" you are not actually hurting the gears, but hurting the engagement mechanism between the synchro and the gear itself, this is how I and others define dog gears.

  10. #9
    Banned dark_rex's Avatar
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    a dog gear is a gear w/o a synchro. all gears in the rex except reverse have synchros to assist in the matching of speeds b/w the engine and the drive axles.

  11. #10
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    there is an outside chance I may be wrong, but my research/experience shows that synchros and dog gears coexist
    Dog gears have always been around. Synchros are relatively new on the scene. In years gone by, trannys without synchros needed to be double clutched to get the dog gears to engage smoothly during all down shifts. Once the synchros were installed down shifting was relativelys straight forward. However, synchros do not necessarily eliminate dog gears.

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