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Differential drain plug in an '80?

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Old Oct 10, 2013 | 08:32 AM
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Default Differential drain plug in an '80?

1980 L48 Auto

Anyone put a bottom drain plug in an '80 or other MY differential with an aluminum case? I was all set to do the job when I saw a comment that because the case on my car was made of aluminum the plug would strip the threads over time. Anyone had this problem? After all, there is already a drain plug in the differential (just in a PIA location).
Thanks
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Old Oct 10, 2013 | 10:53 AM
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Originally Posted by Teem66
1980 L48 Auto

Anyone put a bottom drain plug in an '80 or other MY differential with an aluminum case? I was all set to do the job when I saw a comment that because the case on my car was made of aluminum the plug would strip the threads over time. Anyone had this problem? After all, there is already a drain plug in the differential (just in a PIA location).
Thanks
Its been done many times. There has been more Corvettes built with Aluminum cases than Iron and yet people are still afraid of them. I suppose we could go back to Iron Transmission cases to keep them from stripping out to.
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Old Oct 10, 2013 | 01:20 PM
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Tracdogg2 put a drain plug in the bottom of my differential when he rebuilt it. Very handy.
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Old Oct 10, 2013 | 01:47 PM
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Originally Posted by Teem66
...After all, there is already a drain plug in the differential (just in a PIA location)...
Not quite. That's a fill plug, not a drain plug.
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Old Oct 11, 2013 | 01:14 AM
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You'll never make it in the septic tank cleaning business (the "drain" is on top).
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Old Oct 11, 2013 | 01:57 PM
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There's no problem putting a drain plug in a dana diff. But it does have to be in a certain location.
Mike
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Old Oct 11, 2013 | 09:10 PM
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you will probably change the fluid every 30k ,so you won't be loosening and tightening alot .just don't over torque it .start with a small threaded plug.use sealant on it .
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Old Oct 11, 2013 | 10:58 PM
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do you strip out the oil drain plug when you change the oil???? You will change the dif- lube a lot less time that oil!
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Old Oct 12, 2013 | 04:24 PM
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Originally Posted by lvmyvt76
do you strip out the oil drain plug when you change the oil???? You will change the dif- lube a lot less time that oil!
Apples to Oranges. The oil pan is steel the differential is aluminum.
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Old Oct 13, 2013 | 05:50 PM
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Originally Posted by Teem66
Apples to Oranges. The oil pan is steel the differential is aluminum.
I have been thinking about doing this. Where about would the drain plug go?
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Old Oct 13, 2013 | 09:06 PM
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Originally Posted by bschuus
I have been thinking about doing this. Where about would the drain plug go?
One of the usual suppliers has a kit that has a template for drilling the hole. Sorry I forgot which one.
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Old Oct 13, 2013 | 10:03 PM
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Great I'll check it out. Thanks
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Old Oct 14, 2013 | 09:03 AM
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I just talked to Gus at Corvette Central and he said that their differential drain plug kit will not work on a 1980 differential because it is aluminum. They list the kit as working on 1963 to 1979 MYs.
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