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Stock D30 fill plug question.

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Old 11-06-2014, 03:16 PM
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Question Stock D30 fill plug question.
Does anybody know the thread pitch, or what size thread tap I'd need to make the stock D30 fill plug work on a custom cover I'm working on?

I was told it was a 3/4" NPT thread, but I ordered a tap from eBay, and it is definitely too big. I have about 10 days to finish building this whole axle and this cover and need to figure this out ASAP! Hoping that somebody knows.

Thanks!
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Old 11-06-2014, 03:38 PM
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Hopefully someone else can confirm, but I'm pretty sure its 1/4" NPT, which would make the thread O.D. just over 1/2".
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Old 11-06-2014, 03:52 PM
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believe it's 1/2" NPT
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Old 11-06-2014, 05:03 PM
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Take the fill plug to a shop and have them check it
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Old 11-06-2014, 06:47 PM
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Take the fill plug to a hardware store and use their thread gauge in the nut/bolt section.
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