Can you snap a few pics?

 

That leakage is caused by a contaminated weld at the time of manufacture. Slag inclusions and/or porosity have caused the welds to not contain the gear oil 100%. Dana axle housings use nodular iron that is weldable and Dana axles do not rely on plug welds alone to retain the tubes in the housing unlike other axles. The tubes are firmly pressed in the housing and the plug welds are used as secondary retention. Having defective welds is this particular spot on this particular axle isn't the end of the world and it can likely be easily repaired by thoroughly cleaning the existing plug welds and capping them with some fresh welds. There will be no warping of the housing as a result of re-welding these plug welds.

There is an outside chance that a manufacturing defect has allowed for excessive clearance of the fit of the tube into the housing which could allow for some deflection in the fitting of the two parts but this is somewhat unlikely and perhaps difficult to confirm without removing the tubes from the housing.

 

Its barely leaking... if any...

Should I use JB or RTV?

I'm not welding it.

 

It's cast steel, just weld it and don't worry
about getting it too hot. The axel tube is over 1/2 inch thick!

59

 

I had a leak like that on my Ford 9" on my Jeep. One of the welds on the rear cover was seeping a few drops a day. It was a pain to get a sealed weld over though. There's oil on the back side, and it's a real pain to get the area really clean. I vote for some JB weld first. If that doesn't work, grind it out a much as you can and quickly weld over it the pin-hole. Then re-weld some more.

Good luck,
Phill

 

Just weld it. The weld you are laying down is for leak control, not strength - so don't worry about pre-heating the cast steel for better penetration.

Just clean, clean, CLEAN it before you weld for the best chance of stopping the leaks.