Welcome to PY board!
Nodular 8.2 housings were used by Pontiac in '67-72 Pontiac 8.2 10 bolt A-body applications where a 3.55 Safe-T-Track or 3.90 or 4.33 HD Safe-T-Track were specified. There are quite a few different casting numbers of these housings, some applications there are even two casting numbers for the model year. All will be Julian dated, so if one is a serious restorer, one will need to know the casting # needed, then one starts looking at the Julian date.
The 4.33 ratio had run its course by the time the 71 A-body models were introduced & only a very few '71 400 M22 A-bodys were built with 3.90 HD Safe-T-Track rears. For '71 & 72, that leaves the 3.55 Pontiac 8.2 10 bolt Safe-T-Track A-body rears to have the nodular housing. Quite a few of these were built. Know I've owned half a dozen just from these years & have copies of buildsheets & invoices from many more such equipped cars..
As far as Judges go, I've owned several '69 Judges that were auto a/c cars, they received gray iron 8.2 housings, not nodular housings. same deal in '70. All the '71 Judges came std with the 455HO & as such came with 12 bolt rears, not Pontiac 8.2 10 bolts. hope this helps answer your question.
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