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4 speed muncie question

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Old May 1, 2014 | 08:26 PM
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Default 4 speed muncie question
I would like to change out the gear oil in my 73 four speed Muncie. I know where the fill plug is but there is another plug below the fill plug, anyone know what this is for? thanks
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Old May 1, 2014 | 08:36 PM
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...drain plug?

Sorry, can't actually confirm, my muncie is under the bench right now, not easy to get at.
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Old May 1, 2014 | 10:25 PM
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The drain plug is lowest on the passenger side of the main case, closest to the lower bell housing mount tab. Note the location in this image:

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Old May 1, 2014 | 10:41 PM
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Originally Posted by Dustup7T2
The drain plug is lowest on the passenger side of the main case, closest to the lower bell housing mount tab. Note the location in this image:

Thanks , it seemed logical to me but have learned the hard way , if not sure, ask.
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Old May 2, 2014 | 06:08 PM
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What fluid should go in a Muncie?
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Old May 2, 2014 | 06:38 PM
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the early muncies did not have a drain plug, yours does
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Old May 3, 2014 | 08:47 AM
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Use a GL4 or GL5.
Not a bad idea to add a small bottle of posi lube, to assist gear changes when the box is cold.
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Old May 3, 2014 | 04:58 PM
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Originally Posted by Eljay
What fluid should go in a Muncie?
Typically 85W90 gear oil is used.
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Old May 3, 2014 | 08:19 PM
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Originally Posted by gcusmano74
Use a GL4 or GL5.
Not a bad idea to add a small bottle of posi lube, to assist gear changes when the box is cold.
GL5 fluids have an additive pack that is harmful to "yellow metals" such as Copper and Brass. What are your Sync's made of ?
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Old May 3, 2014 | 09:06 PM
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Use Sta Lube 85w-90...learned the hard way...

Toasted a Muncie with Synthetic GL5 crap!
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Old May 3, 2014 | 09:12 PM
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Quick search for brass synchros in a Muncie will tell you GL4
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