Jeff,

Pick up a set of ramps+large drain pan(10 QT.)...get a tranny filter here and
get the fluid locally...drive that baby up and chock it with the "E" brake on.
find your torque converter drain plug underneath and drain (replace gasket
on the drain plug).Then drain the pan(replace the gasket on the pan plug
too)...remove the pan ...replace the filter...replace the pan ,torque to specs
in expanding sequence...refill tranny and check when warm on absolutely
level ground.Enjoy
OR let a professional Independent do it.
DO NOT,"Flush It".The chances of damage are
not worth it.

__________________
'84 300SD sold
124.128