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1981 Diff Cover Bolts

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Old Oct 28, 2010 | 08:32 PM
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Default 1981 Diff Cover Bolts
I am trying to figure out what size bolts the are used to hold the diff cover on a 1981 rear end. I bought what I thought were the right capscrews 12mm x 1.75 pitch but they do not fit.

I have checked the 1981 shop manual and the 14A Parts and Illustration manual to no avail.

Any ideas?
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Old Oct 28, 2010 | 09:05 PM
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I don't believe any of the C3's had metric bolts. Prior to 80 they had 7/16-14 bolts.
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Old Oct 28, 2010 | 11:32 PM
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I'm going to Guess that they have a 1.25 Pitch or possibly a 1.50. If You have a Tap set try screwing them in till You find the right one.
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Old Oct 29, 2010 | 07:57 PM
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7/16 x 14 tpi SAE, it turns out.
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