Does anyone know a source for the seal that seals the rear of the propeller shaft on a 3/4 ton 4-speed. There's no seal number on the outside and I'm afraid if I pull it out to find a number on the back, I'll be out of luck if I can't find one. I've tried Jim Carter, American Classic Truck, Chevys of the 40s, and Obsolete Chevrolet Parts Co, found all the other parts but not the shaft seal.
Thanks,
