Fab 9 axles are leaking. One is bad enough to soak the wheel. Orings don’t feel terrible but are potentially 20 years old. Is there anything I can do besides just trying to replace the orings? It doesn’t look like it’s coming through the bearings but if it is, just replace bearings?

I’ve always put a little silicon around outer bearing

Check that your vent is not plugged.

Consider trying HYLOMAR BLUE . Hylomar is non-setting jointing compound with easy disassembly and clean up.

quote:

Originally posted by Tech:
Check that your vent is not plugged.

Can’t be plugged if it doesn’t have one!

I’ve had the car for awhile but only ran it a couple times this year and last fall. Rearend was alway wet, assuming this is why. It’s a fab 9 in an RJ car. Only thing I can figure is it used to have a vented fill cap and somebody changed it to a non-vented cap.

must be vented

vent and very lite coat of sealer on bearing. Had one do same and sealer worked great.

X2 on the vent, if plugged clear it, if no vent add one. RTV around bearing OD as well.

Don't over fill the unit.
None of the axle / bearing seals are designed to hold fluid submerged.
You just need enough lube to give each side a splash as you've turned a corner.

As was advised by others here, I put 2 quarts of fluid in my 9” diff and call it good even though its below the overflow fill plug setting.

2 quarts is not enough in mine ,at 2 its barley touching the ring gear.i run four with no issues