Originally Posted By: ford46guy
Originally Posted By: spasm3
The plug is high up on the front of the axle, its a square type, there is not enough left to get a grip and its rusted solid. Its not coming out.
They way it looks i'm not even considering trying to get the fill bolt out. Its the diff cover bolts i'm worried about. There is no drain plug so the only way to dump the gear oil is to remove the cover. I'm worried about bolts shearing off in the body of the diff. I recently had transmission pan bolts shear off.
Diff bolts should be encircled with RTV, and the chances of breaking off are slim. I know on a Ford 8.8 it is a pretty heavy duty bolt, because it provides some support to the case.
If they do break off they should be easy to take out, you will have plenty of access to heat and drill out.
A welding place can put a nut on the plug easily, that can be an option too. Once it is welded it will break any rust bonds. Maybe $25-30 to do something like this. I have a guy that I hand a $20 for this work. Takes him 3 minutes.
An easy out may be an option too. If it is 3/8" square drive you can probably get a big one in there, less chance of breaking off.
If you have to leave the plug in place, make sure you can find a rear end cover with the fill plug that can fill to proper level. They are quite pricey too.
Wow.Dude....great advice all around!