8 3/4 grease leak .

toolmanmike said

Axle seal THere's a seal a few inches into the housing and another seal by the bearing

View attachment 1715400242

Click to expand...

Not awake yet eh? :D

To the OP, like mentioned you can use sealer under the washer.
Just fill the gap between the splines and washer completely with RTV.
You will want to solvent wash it first so the RTV can stick to the metal.