Hey Everybody,
I'm about to embark on my first real maintenance journey.  I've been
having shifting difficulty with the advance of cold weather here in PA,
so I'm changing the transmission oil (putting in the highly recommended
Redline MT-90).  She is a four-speed, manual transmission.

I crawled underneath today, to look around for a moment, familiarize
myself with the workings.  I have the Haynes manual (didn't splurge on
the Bentley yet), which is of no real help in changing the gearbox oil,
only in checking the level of fluid.  Anyway, I'm wondering where the
drain plug is to drain out the old oil?  Upon my brief inspection today,
I saw a rather large hex nut (looked like an oversize set-screw, maybe
1" diameter),  which would require an allen wrench to remove.  It was
located in the middle of the transmission, closer to the motor.  Is this
the drain plug?  If so, where do I get the large allen wrench, or is
there some other tool?

After I do drain the oil, I'm unsure of the level to which I refill the
transmission with fresh oil.  I read in the Haynes that the four-speed
requires the fluid to come up to the level of the refill plug.  But in
an inquiry I made a few weeks ago about gear oil, some listees informed
me to only fill to a level 9/16" below the refill plug.  Which is
correct?  Thanks to anyone and everyone who can help me out.

Mike Korsak