Axle/Differntial Seal leak?

[Number4]

This is the drivers side front axle.

I'm assuming the leak is coming out of the axle input shaft seal. There's oil up on the chassis, but not beyond a point. So the oil appears to be being thrown by the spinning axle vs. dripping down. Axle boot seemed intact.

Let this go? When should it be tackled?

 

[leadfootdriver]

It's definitely seeping, but it doesn't look like it's leaking to the point where it's dripping all over the place.

My front pinion seal was leaking, so I changed the seal, and put in 75w-80. The clean oil leaked all over the place, and trailed under the vehicle. So, I had to do the job again with a new Yoke and a new seal that I got from Ford that was revised, and actually way different than the seal I got from the joe shmoe parts store. Check with Ford Parts to see if there was a revision for sure!

The point is there might be some good groves on your driveshaft, so it might be a safe bet to replace the DS along with a new seal. Front DS's are actually pretty cheap anyways. I didn't think my yoke was that bad, but I was wrong. I also refilled with regular 80w-90 GL-5 which is what the OM recommends anyway..

Removing a front Driveshaft is a big job on a truck because the parts are big and heavy. I'd hate to have to do it twice.