T9 Five Sp Rebuild NSW

Hi guys,
After just getting my ride up and running with the new engine, the gearbox is now whining and banging. Happens mainly on deceleration but when hot whines on acceleration. Can be hard to put in to first at stand still. Has plenty of 90 grade oil. Mind you has copped over 10 years of abuse  Any idea of a good rebuilder in NSW I have tried Gearbox Factory Greenacre a few years ago but said he would throw it over the back fence next time I bought it back.