Thanks for your input Southluke,
 The rain finally let up, the sun came out & the temperature rose to a
seasonal norm here in the wild West Kootenay Mountains. So as per the
instructions on HMA Service & your manual, I did drain the tranny thru the
hose to the cooler -a little hard on the hands in the tight space between
grill & rad. Then opened the drain plug on bottom of tranny, cleaned off the
magnetic shaft on end of drain plug, reinserted plug. I had on hand about 3
1/2  litres (US quarts) of fresh older spec tranny  fluid from Hyundai so I
used that as the sacrificial flush, redid the flush steps -not letting it
run for more than 30,40 seconds, drained again, changed my spin on tranny
oil filter (may be an XG item only- looks just like a normal oil filter but
is not) & refilled carefully to get the right level -took about 6 litres.
I've got to say I could feel a big difference when test driving. Was getting
a bit of a 4th-5th shift shudder here in these extreme mountain roads with
10% grades , but with that new fluid a very noticeable difference -quicker,
tighter shifts.
Now as you say to start the next fund raiser to save for the next time
50,000 km rolls around. Of course, if you have your ear to the ground peak
oil may look after this for us, there may be no affordable gas to get me to
50,000km ! Nonetheless, still love to drive that hot rod XG & feel the G's
with my foot to the floor.
BCinBC
PS: For where we live I think my next 'car's going to be a horse!