What is the drain plug size on a 3000gt manual transmission?

Question

there is small oil fill and a large oil drain plug its fwd

Answer 1

drain plug on the transmission?

Answer 2

the most common bolts used on any 3000GT is going to be 10mm and 14mm.

Remembering off the top of my head its a 14MM.

Answer 3

to drain it, you need the 1 on the bottom.if it,s a square headed plug, you can use adjustable wrench or it might be the kind that you can use a 3/8 ratchet on.