Dana M275 rear diff cover bolt size, 12pt 13mm?

WhiskyThrottle

Tremor Fiend
Joined
Oct 20, 2020
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Location
Central TX
Military
retired
Current Ride
18’ GT350; 21'AMB F-350 Tremor
I can't find where it's documented and I can't find a 12pt 13mm to test it, but I know 12mm and 14mm are not it. Is it maybe SAE?
Who knows?
 
Try 1/2 inch or 9/16
 
The most frustrating part was that I didn't have and 12pt 13mm to test it. Did this one seemingly common tool escape me all these years or has it recently disappeared? :unsure::cautious:
 
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