guys, the best way to fill it up is : after u drain it from the bottom plug put that plug back then take the filler -level plug out on side of the b/box and use a pump to fill it up ( i use compressed air to pump it up there ). if u want to get to it from the top this is how the gear stick comes out .
take the trim mould off , gearknob off , boot off , ( u need new cable tie to put back )then there is a c-clip that u have to take off ( u need a long nose to sqeeze it )once u take that off the gear stick just comes out .
warning here though u won't know when its full unless the filler -level pug is out but even then if u fill from there i'm not sure that it will go in to the box on gtrs 4wd 's it won't, it will end up in the trasfer case .
don't bother doing it this way besides u should be able to take the plug out so u can check the level everytime u do a service so u must be able to take the plug out .
u need a long wrentch ( like 300 mm ) with a 1/2 inch drive ( or maybe 3/8 cant remember ) its shouldn't be that tight i never have any trouble undoing it .