Jeff and Tamara Nelson wrote:

> 17 mm.  It's a good idea to remove the filler plug before the drain plug
> in case you run into trouble...
>
> JN
>
> Chad wrote:
> >
> > What size allen wrench is required to remove the filler plug on a 4sp manual
> > tranny for an '85 GL?
> > thanks

I took a bolt with a 17 mm head and welded it into an expendable half-inch drive
socket using high strength welding rod.
  You might be able to put a 17 mm nut part way into the plug and turn it with
a socket.

Larry
91 GL
Chicago