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  1. #1

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    Gear oil in trans....is it f'd?

    So I went to disassemble the whole drivetrain/suspension/cradle assembly out of my parts car to get it ready for installation. I pull the cv shaft and out comes gear oil, lots of it. I'm fairly certain it was way overfilled. Is this thing junk? or can I refill with the proper stuff and go about my business?

  2. #2
    awelch37's Avatar
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    Gear oil in trans....is it f'd?

    Quote Originally Posted by leadfootny View Post
    ... I pull the cv shaft and out comes gear oil, lots of it. I'm fairly certain it was way overfilled. Is this thing junk? or can I refill with the proper stuff and go about my business?
    By gear oil I guess you mean 80W90 or similar?

    A quick read indicates that you have to worry about chemical attack on the copper or brass parts ...if it is not GL-1 class.

    From wiki ... "EP additives which contain phosphorus/sulfur compounds are corrosive to yellow metals such as the copper and/or brass used in bushings and synchronizers; the GL-1 class of gear oils does not contain any EP additives and thus finds use in applications which contain parts made of yellow metals."

    I'd try the proper stuff if it was in still the vehicle.

    That's my 2 cents ...


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    Last edited by awelch37; 06-06-2017 at 08:59 PM.

  3. #3

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    I've seen 50 weight kill more than one that's for sure.
    http://our6thplanet.com/
    40 something saturns.. oh who fraking counts anymore

  4. #4

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    Yes, something like a 80-90w. Was very viscous, opaque and smelled like gear oil. I would just run it and see if it was currently installed. Since its sitting on my shop floor, I am wondering if it's worth the trouble seeing if it's good or not. I did test drive the car before the trans got pulled. It definitely took some finesse to get it in 1st but I attributed it to the trashed shifter. Can I disassemble it to check synchros and such or should I not bother?

  5. #5
    siris's Avatar
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    If it's already out consider it trash, would be a kick to the dick to reinstall just to have to tear it back out.
    72 Charger: pissed me off, on jackstands.
    95 SW1m: Dohc swap. DD. I can haz boost?

  6. #6
    6S Moderator S.Bretz's Avatar
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    Gear oil in the trans is bad. The friction material that is on the inside of the syncronizer blocker rings is the same friction material that is used to make the clutches in the automatics clutch packs. With the use of gear oil that material swells up and will start to delaminate from the steel backing. You will notice very hard shifting and then possible not be able to shift at all as the friction material swells.
    -6S Resident Mechanical Forensics member #001.
    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
    1998 F-250 5.4L triton...stock.

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