Re: Nodular 9\"
Nodular, or 'N' case rear ends do refer to the third member, or the 'Hogs Head' (always hated that term)...
It will have an extra reenforcing web, and have a large (about 2" tall) 'N' cast into the iron housing right above the pinion bearing boss.
There is such a thing as a 'disguised N case', it has the extra webs, but it isn't nodular iron, so it doesn't have the 'N' cast into it at the foundry.
The 'N' on a real N case is raised, like most mold marks in cast iron. There were some guys counterfeiting 'N' case rear ends by grinding the 'N' into the housing, but that is easily spotted...
Remember, if it's real, it's raised.
jjc is correct about the welding with low hydrogen, high nickel rods.
Do short welds, as not to warp the axle housing.
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