I'm grateful this topic has come up, since I'm a bit confused about the rear end in my own car ('69 Cutlass). The guy I bought it from said it's an OLDS 12 bolt, but the car was Canadian built, which I was led to believe means it has a Chevy rear end. I'll look for the upside down V someone mentioned earlier. Isn't the type O an 8.3", not an 8.5"? I'm not trying to split hairs, I just want to know if there's an internal difference (at least in strength) between the Chevy 8.5" 10 bolt and the type O 12 bolt. I can live with the strength of the 8.5" rear, but anything that's only marginally better than the 8.2" probably won't cut it. THIS site describes the Chev 12 bolt cover as scalloped, which I believe refers to the bulge not present on the surface of the Olds 12 bolt cover. If that's the case, it looks like shaks has the Chev version.... right?
- GoldOlds
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