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  1. #1
    Join Date
    Jul 2005
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    Default Fluid for Muncie 4 speed

    As I was putting my tranny in the other day I remembered that it didn't have any fluid in it. It's a 1970 Muncie M20 What is the best stuff to put in it? Do I have to drop it or can I use the drain plug to fill it? How much do I put in?
    Robert Lewis
    1959 Buick Electra 4 Door Sedan
    1959 Pontiac Starchief 4 Door Hard top
    1976 W200 Dodge Power Wagon 383/727 4x4
    http://www.pontiac-59.com/

  2. #2
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    Default Re: Fluid for Muncie 4 speed

    This is an "it depends" situation. Early Muncies only have a fill plug, so you have to find a way to evacuate the old fluid if you want to replace it. You ten fill from the same plug until the fluid is level with the bottom of the plug hole. If you're lucky and have a later trans, it will have both a fill and drain plug making life easier.

    http://www.5speeds.com/P0001763.JPG

    80W-90 lube is popular, you'll need around 1.5 quarts.

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  3. #3
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    Exclamation Re: Fluid for Muncie 4 speed

    You need a GL-4 lubricant.

    I use Amsoil Severe Gear 75w-90 sythetic in my M21/

    It shifts like butter......

  4. #4
    Join Date
    Jul 2005
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    Default Re: Fluid for Muncie 4 speed

    There is no fluid in it right now. It was drained out when the guy shipped it to me. I'll fill her up then. I'll look into Amsoil.
    Robert Lewis
    1959 Buick Electra 4 Door Sedan
    1959 Pontiac Starchief 4 Door Hard top
    1976 W200 Dodge Power Wagon 383/727 4x4
    http://www.pontiac-59.com/

  5. #5
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    Default Re: Fluid for Muncie 4 speed

    Quote Originally Posted by poison heart View Post
    There is no fluid in it right now. It was drained out when the guy shipped it to me.
    Sorry, I read that in your first post...and promptly forgot it!

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  6. #6
    Join Date
    Sep 2002
    Location
    Michigan
    Posts
    375

    Default Re: Fluid for Muncie 4 speed

    I suggest staying away from synthetics. I tried it twice and broke the trannys within a very short time. Went back to standard grade oils and have had no problems since.

  7. #7
    Join Date
    May 2003
    Location
    Mobile,Ala.
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    1,769

    Default Re: Fluid for Muncie 4 speed

    If you are going to use the trans in a high RPM motor I would use a gear oil as close to 75 wt as possible , but as an every day driver the 90wt would be fine .


    Mike Williamson
    71 GSX Stage1
    67 GS 400

    BPG #1996

  8. #8
    Join Date
    Jul 2005
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    Canyon Lake, Texas
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    525

    Default Re: Fluid for Muncie 4 speed

    I don't plan on reving this thing over 6000. It's not a daily driver either. Just a cruiser street car. It'll have some balls though.
    Robert Lewis
    1959 Buick Electra 4 Door Sedan
    1959 Pontiac Starchief 4 Door Hard top
    1976 W200 Dodge Power Wagon 383/727 4x4
    http://www.pontiac-59.com/

  9. #9
    Join Date
    May 2003
    Location
    Mobile,Ala.
    Posts
    1,769

    Default Re: Fluid for Muncie 4 speed

    Robert if you can find the 75-90 gear oil you should be fine . good Luck .


    Mike Williamson
    71 GSX Stage1
    67 GS 400

    BPG #1996

  10. #10
    Join Date
    Aug 2004
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    Exclamation Re: Fluid for Muncie 4 speed

    The GL-4 requirement is important. It protects the brass parts in the tranny.

  11. #11
    Join Date
    Nov 2003
    Location
    Texas
    Posts
    572

    Default Re: Fluid for Muncie 4 speed

    Quote Originally Posted by PaulGS View Post
    You need a GL-4 lubricant.

    I use Amsoil Severe Gear 75w-90 sythetic in my M21/

    It shifts like butter......
    Will the GL-5 fluid be ok also?
    Jeff Horsman
    1986 White Regal T-type
    In Process: 1971 Cortez Gold Skylark Racecours 470 cu.in.
    1972 Chevy C20 Custom Camper aka Big Blue

  12. #12
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    Sep 2004
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    Michigan, USA
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    Default Re: Fluid for Muncie 4 speed

    The GL-5 has the additives that are hard on the brass parts.

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  13. #13
    Join Date
    Jul 2005
    Location
    Canyon Lake, Texas
    Posts
    525

    Default Re: Fluid for Muncie 4 speed

    I put valvoline 80-90 in it. I got maybe 1.25 quarts in it. It's right below the fill plug. I guess that's as much as it takes? I guess there could have been a little left in it when it was previously drained.
    Robert Lewis
    1959 Buick Electra 4 Door Sedan
    1959 Pontiac Starchief 4 Door Hard top
    1976 W200 Dodge Power Wagon 383/727 4x4
    http://www.pontiac-59.com/

  14. #14
    Join Date
    Sep 2004
    Location
    Michigan, USA
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    Default Re: Fluid for Muncie 4 speed

    Sounds like you're good to go.

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

 

 

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