Sierra Diff fill plug size

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ScottR400D
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#10 That's interesting Geoff. My 2015 6 speed has 1 x  M10 and 1 x 3/8" hex plug! 

My BMW diff doesn't have a drain plug. 

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Geoff Brown
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Three years makes all the difference between a 95% & 100% metric chassis ? Sorry Diff fill plug. (ammended) 

ScottR400D
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My chassis was hardly metric, Geoff, I'm not sure that exists. *smile*. 

It's hard to understand why they changed just one of the two plugs in the 6 speed too! 

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rj
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It certainly is metric - just a bit unsure if it's M18 and not M20.

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Sierra final drives have all metric fastenters, CC merely machine off the re portion of the OE cover

M20x1.5

I use this one, much much easier access with a ring spanner Thumb Up 

https://www.ebay.co.uk/itm/312779345179