[crosby]

Thanks Aussie. It looks to be the original box. The truck has about 90k on it, and it still has the three groove pitman arm, which I understand when you buy a rebuilt box, only comes in four groove? There's plenty more thread and space, I am thinking maybe the threads are gunked up with all the crud that has accumulated over the years. Tomorrow I'm going to try and clean the bolts up as best I can and see if that helps. Thanks very much for the info!