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Hey Jim, thanks for the info, its a real help !! I am familiar with the different "series" carriers 2 series, 3 series, 4 series in my 67 chevelle SS 12 bolt. So i'm not surprised to hear that same is true for this Olds diff. Glad to hear you have a diff and ring and pinion that needs a ho...

Hi, can anyone shed light on the 12 bolt diff in my 1970 olds 98 ? It has bolt in axles, unlike GM 12 bolt c-clip style. I'm trying to track down a used posi carrier, ring and pinion gears or internals to convert the diff to posi. I'm pretty familiar with GM rears but this one has me stumped. Was th...