What size allen wrench for auto transmission drain bolt?

[detroiter]

Wondering what size allen wrench is needed for the drain plug on auto trans. Thanks

[detroiter]

Bueller...Bueller...

[CTScott]

10mm, which I didn't have on hand when I needed to change Crashy's, so I used a 3/8".

[pennyracer]

yep 10mm

[detroiter]

Thanks guys, appreciate it!

[bzinn 1]

careful gettign it out,mine was really in there,thought I was gonna strip the threads.

[yougojay]

thank you, knew I had seen this post before - Drain & fill time this Spring.