Ok, so it was from a Lincoln.
The Dorman replacement reservoir just came in, and I like it better than the one that came off of Huck. Not only does it appear to be welded all the way around, it is also welded between the two reservoirs. So I'll check it in a bit for leaks and, if there are any I'll use the flowable RTV on it. But I'm betting it is SEALED.
As for the rear axle, yep its been messed with. (New bearings, gears, seals, Truetrac, rear cover, etc.) In other words, there isn't a bolt on Big Blue that hasn't been turned since it left the factory. And with the exception of the rear axle, there's not a bolt that
I haven't turned.
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI