Hello i bought a maverick grabber a while back for parts. I removed the rear end but i have trouble to find where he came from no ID tag on it. Its seem to be a 9 inch 28 spline lenght os 57.25 and tappered end dont find info anywhere here some picture.
It's probably the '57-'59 Station Wagon, Ranchero housing. https://www.therangerstation.com/tech_library/9InchAxles.shtml
It could also be one from 65-66 Mustangs with "K-code" HiPo 289, those came with tapered axle tubes on the ends...... David
I think the '66 had something different going on around the fill plug area. Here is the '65 K-code rear I had under my Falcon.
I seen this rear end housing go for $1,400 a few years ago on eBay...with no axles, backing plates or gear, just the housing