8.2 10 bolt Drain plug sizes? - Impala Tech
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post #1 of 5 (permalink) Old 10-01-2019, 07:41 AM Thread Starter
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8.2 10 bolt Drain plug sizes?

Was there 2 different sizes of pipe end drain plugs for 68 10 bolts?
I see online there is a 3/4" and a 1" Why the different sizes?
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post #2 of 5 (permalink) Old 10-01-2019, 01:02 PM
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What are you talking about? GM 10 & 12 bolts don't have drain plugs. You just loosen the cover.
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post #3 of 5 (permalink) Old 10-01-2019, 03:43 PM
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I think he is talking about the NPT plug in the case to add fluid. It was a half inch tapered thread from memory.

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post #4 of 5 (permalink) Old 10-02-2019, 09:35 PM Thread Starter
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That's the plug, Dave. Mine isn't the 1" variety. However, there are 2 different sizes for both 10 and 12 bolt diffs. Was wondering why GM didn't have a standard size
pipe end filler plug.
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post #5 of 5 (permalink) Old 10-02-2019, 09:41 PM
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One inch went into the back of a Chevy rear housing (drop out Salisbury style) found on tri five Chevy's and up through 1964.

All Spicer rear ends used the same fill plug whether a 10 bolt or a 12 bolt rear. On larger Dana rear ends the plug size increased as the carrying capacity increased. Some Semi's I have seen the plug was practically an inspection port, and used a stamped steel plug, instead of a cast iron one.

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