Matt, you have really peaked my interest on this. It makes sense that some sort of cover would be installed to keep the grit and grim out. I have reviewed my 36 and 37 GMC parts manuals and will pour over them tomorrow, but so far I have found nothing that references this cover. Since the turn down grease cap never moved I can see why the cover would be in place there. The clutch fork, with its constant movement probably would necessitate that no cover would be installed there. I will contact some 36 GMC owners that I know and see if they had any remnants of this cover on their bellhouseings. Thanks for bringing this to light, Matt.
