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I couldn't find a NTv2 file for transforming GCS NAD83 to GCS NAD83(CSRS) so I'm trying to create a custom transformation using the 'Create Custom Geographic Transformation' tool in ArcMap. The tool seems pretty straightforward but I don't know what transformation method I should use.

I'm using ArcMap 10.3 and am working in UTM zone 11N (in BC) if that is useful at all.

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    Is the data in Alberta or British Columbia? Generally, you need to contact the provincial geodetic agency to get NTv2 grids. – mkennedy Jul 31 '15 at 17:56
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    It's in BC. Thank you, I will look into that. – dragyn Jul 31 '15 at 19:33
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    BC has published a bunch. Look for their MASCOT utilities. Once you agree to their terms, you can download the gsb files. – mkennedy Jul 31 '15 at 19:38
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    Update: I got in contact with GeoBC and they did have the NTv2 file I was looking for. Thank you! – dragyn Aug 6 '15 at 15:34
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    You might want to turn that into an answer! – mkennedy Aug 6 '15 at 16:50
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Update: I got in contact with GeoBC and they did have the NTv2 file I was looking for. Thank you!

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