dennis112
15 Year Member
As mentioned, normally the axle seal is found inside the axle tube and its rubber sealing lip rides on the axle.
Aftermarket axles often come with special bearings that have O-rings for axle seals. They do not use the factory stuff and the axle is not machined for the rubber lips, as mentioned above. The O-ring fits in a receiver groove on the outside of the bearings diameter and that O-ring seals against the housing's bearing bore. It is highly probable that the axles/bearings may have been replaced when the spool was added.
Here is a picture of an aftermarket Moser axle with wheel bearing and O-ring seal that I have in my Mustang:
Aftermarket axles often come with special bearings that have O-rings for axle seals. They do not use the factory stuff and the axle is not machined for the rubber lips, as mentioned above. The O-ring fits in a receiver groove on the outside of the bearings diameter and that O-ring seals against the housing's bearing bore. It is highly probable that the axles/bearings may have been replaced when the spool was added.
Here is a picture of an aftermarket Moser axle with wheel bearing and O-ring seal that I have in my Mustang: