muncie 4 speed
Thread Starter
Racer
Joined: Mar 2005
Posts: 487
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From: Jacksonville FL
muncie 4 speed
do all muncie 4 speeds have brass syncronizers?
did they stop using brass after a certain year?
i have a 73 and the FSM says to use a GL-5 gear oil but a recent thread here says to use a GL-4 oil in a muncie.
aparently, the reason for using the GL-4 is because GL-5 oils are not friendly with yellow metals (brass, bronse, copper....)
does anybody know if the syncros are brass inside of a 73 muncie and if so, why would the FSM say to use a GL-5 oil?
did they stop using brass after a certain year?
i have a 73 and the FSM says to use a GL-5 gear oil but a recent thread here says to use a GL-4 oil in a muncie.
aparently, the reason for using the GL-4 is because GL-5 oils are not friendly with yellow metals (brass, bronse, copper....)
does anybody know if the syncros are brass inside of a 73 muncie and if so, why would the FSM say to use a GL-5 oil?
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Originally Posted by mdj21
do all muncie 4 speeds have brass syncronizers?
did they stop using brass after a certain year?
i have a 73 and the FSM says to use a GL-5 gear oil but a recent thread here says to use a GL-4 oil in a muncie.
aparently, the reason for using the GL-4 is because GL-5 oils are not friendly with yellow metals (brass, bronse, copper....)
does anybody know if the syncros are brass inside of a 73 muncie and if so, why would the FSM say to use a GL-5 oil?
did they stop using brass after a certain year?
i have a 73 and the FSM says to use a GL-5 gear oil but a recent thread here says to use a GL-4 oil in a muncie.
aparently, the reason for using the GL-4 is because GL-5 oils are not friendly with yellow metals (brass, bronse, copper....)
does anybody know if the syncros are brass inside of a 73 muncie and if so, why would the FSM say to use a GL-5 oil?
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Originally Posted by mdj21
ok, thanks.
but is it GL-5 like the FSM says to use or is it GL-4 like others have suggested to use?
but is it GL-5 like the FSM says to use or is it GL-4 like others have suggested to use?
Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
Autogear recommends Valvoline 80-90 for their Muncies. It's an API GL-5 spec, but it as a sub-spec of MT-1 which the engineers at Autogear say is good for the yellow parts. Others conventional lubes (Castrol, etc) don't have the MT-1 sub-spec.
They also strongly recommend to NOT use synthetics with their Muncies.
Fyi,..
They also strongly recommend to NOT use synthetics with their Muncies.
Fyi,..
Last edited by 73, Dark Blue 454; Jun 25, 2006 at 06:53 PM.
