[19Fordy]

I replaced FRONT 1940 Ford axle hub seals yesterday. Maybe this will help. No special tools needed. Just patience. The new seal I installed is numbered LYO 37002. It came with the MT Products Lincoln Brake Kit. The old seal is CR-15707-USA made by Chicago Rawhide. I don't know if they are still available.
Step 1. Apply a light dab of oil all around the perimeter of the seal.
Step 2. Place drum/hub upside down on a hard surface that won't "give". I used garage floor.
Step 3. Hold seal in place and while keeping it level gently
tap" seal on the top of its perimeter to get it used to fitting. It took me about 10 tries to get it level. Do not bang on it if it goes in crooked. Instead, pull it out and up with your fingers and keep trying. It will eventually take a "level set" in the opening. You must have patience and develop a light but firm "taping" with your hammer.
Step 4. Once it's "set level" in the opening place a stiff piece of metal across the seal and gently tap it all the way in until seal is even with the hub. Hope the photos help. I "staged" them after the seal was in place, but I think you can get the idea.