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Discussion Starter · #1 ·
I've read at least 50 post pertaining to changing the fluid in the transfer case but I've not yet found one that contains info pertaining to what size wrenches are needed to remove the transfer case drain and fill plugs on a 2013 Chevy Silverado 2500HD with Duramax/Allison.

I prefer to use a wrench of the required size instead of an adjustable wrench or pliers. I believe these plugs may be metric and if so, I need to purchase wrenches of the appropriate size.

If anyone has this info please advise and thank you in advance!

Best regards,

Keith
 

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An 18 mm wrench is what you need. At least thats what mine takes.
 

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^x2
 

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Discussion Starter · #4 ·
Thank you both very much!
 
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