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#1
08-05-2021, 02:40 PM
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Differential casting numbers
Where can I find a chart that tells the years for casting numbers. I have a rearend with 9799100 . Just for curiousity did BOP use the same numbers and axle codes? Thanks for great website.
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#2
08-05-2021, 04:16 PM
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'70-72 LATE Pontiac 8.2 Gray iron center housing. Axle tubes could have outboard flat spots on top for a '70 GP, or could be regular round tubing all the way to the axle flange.
BTW, no such thing as a "BOP" 8.2. Early Buick 8.2's, Early Pontiac 8.2's, Late (68-70) Buick 8.2's and LATE Pontiac 8.2's.
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#3
08-05-2021, 04:40 PM
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Might also ck the casting date in the webbing, the 9799100 gray iron casting 8.2 Pontiac 10 bolts were also used in many '69 model Tempest-GTO's.
It's very odd but I have several clean '69 Pontiac 8.2 gray iron rear housings which were originally 3.23 STT GrandPrix rears, each has a different casting number. Thee '69 GP 3.23 coded housings are typical sealed axle bearing housings, not the later tapered axle bearing Pontiac 8.2 housings.
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