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Old 06-13-2024, 10:26 PM   #3
Diastole
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Join Date: Feb 2024
Location: Smoky Mountains
Posts: 73
Default Re: Rear Diff Plug HELP

Y-Blockhead,
Help me understand, pipe threads are tapered threads? Is that right?

I am new to all this.

The inspection plug I removed was non-tapered and ALL the suppliers sell only non-tapered plugs.

https://www.snydersantiqueauto.com/p...8061&cat=41823
https://www.brattons.com/DIFFERENTIA...ductinfo/5920/

In this "new car to me" and my first Model A, the drain plug I removed is tapered. See last photos, the plug tapers in the calipers.

So, what do I do?

The only replacements are non-tapered. Do I reuse the old drain plug because it is tapered.
And, since the old inspection plug is now welded onto a piece of square bar, I have to replace it. All the replacements are cylindrical, non-tapered.
But, it looks like the plug I removed was non-tapered, but it is so short, I cannot be certain.

Diastole
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