I am about the task of swapping out all fluids when I came upon something I made 15yrs ago for getting the fill and drain plugs out
of the ZF6. It's a 11/16in nut welded to a 1-1/16in nut. It is low profile for getting in that tight space at the fill plug and can be place inside a 1-1/16th in socket for use with a ratchet. AND if you were careful not to over tighten the plugs the last time you change oil the whole process of removing the drain plug and fill plug is a breeze.
