Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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The casting number 9779822 is going to be from a '65 Pontiac 8.2 10 bolt, possibly an early '66 8.2 Pontiac rear. The first '66's were the same width as the the narrow '64-65 Pontiac 8.2 rears. A little later in '66 production, the slightly wider Pontiac 8.2 rears were introduced.
If the rear was about to go on my build bench, I'd ck out what posi is in it. Also if axle bearings are originals, or have been replaced. Sealed axle bearings are ticking time bombs and eventually seize and chew up the axle, so I nearly always replace 'em. On the posi unit, it maybe an original two pinion posi or a later 4 pinion posi, or an Eaton or Auburn. With a low ratio Pontiac 8.2 carrier, 3.36 is as a high a ratio as you can go. With 27" tall tires, 65mph is bareable, but with 25 1/2 to 26" tall tire/ wheel combo, the engine is going to buzzing right along. What does the '64 have for an engine? Modest cammed 389 stocker, or something quite a bit stronger? Trying to understand the close ratio Muncie with a set of 3.36's.