AMC 20 rear axle question

[mrhc]

Can't find something that will fit into the fill plug of the AMC 20 rear axle on a cj7. 1/2" wrench doesn't fit - too big. It looks like a hex, would this be right and what size would it be?

 

[rock316]

Can't find something that will fit into the fill plug of the AMC 20 rear axle on a cj7. 1/2" wrench doesn't fit - too big. It looks like a hex, would this be right and what size would it be?

mine is an allen wrench size 10mm

 

[Saddle Tramp]

Try a 3/8” ratchet (without the socket), should fit.

 

[big_o_tom]

I always used an allen wrench, a big one.