8&3/4 axle fitment problem
here's a thread with some pics of an install
https://www.forabodiesonly.com/mopar/threads/8-3-4-axle-seals.451950/
if you notice, in the housing there is a lip that the bearing seats against. the seal, obviously inboard of that needs to go in far enough so that the bearing retainer will clear. so like 1.75" or so from the flange of the housing.
it's not a measurement that's set in stone, because there's a lot of seal surface area on the axle. but it's critical that it clears the bearing retainer and *if* the axle is previously damaged/scored that the new seal doesn't ride in that groove.
here's a pic of about where the seal should sit.
edited to reflect the correct distance of seal face from housing flange