Tom - Here's a 1-1/2 & 2 Ton diagram from the
1947 Truck Shop Manual (same diagram as shown in the 1942-46 manual but only listed as 1-1/2 ton in that book) showing the single speed axle cross section view. Hope this will help you see what is where and it does look like you can replace the seal like you want, although yours might be as stubborn as Puffie40's. Hoping not!
