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Help with gearing for B Body O style 12 bolt axle

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Old September 1st, 2018, 11:58 AM
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Help with gearing for B Body O style 12 bolt axle
I have a 1972 Delta 88 convertible that has the 12 Bolt O style rear in it. It has a Posi carrier in it casting # 761 with 2.73 gears on it. Does anyone know specifically which ring and pinion ratios will fit on this carrier?
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Roy
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Old September 1st, 2018, 12:29 PM
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Originally Posted by Fastmax32168
I have a 1972 Delta 88 convertible that has the 12 Bolt O style rear in it. It has a Posi carrier in it casting # 761 with 2.73 gears on it. Does anyone know specifically which ring and pinion ratios will fit on this carrier?
Thanks
Roy
The big car Type O uses a unique 9.3" ring gear. NO ONE sells new gear sets for these and nothing else fits. The factory made gears in ratios up to 3.42:1, but good luck finding used ones today.
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Old September 1st, 2018, 12:45 PM
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Thanks Joe, I am aware of that.
Roy
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Old September 1st, 2018, 01:05 PM
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Sorry, I misread your original post. The parts book shows that your 9.3" Type O anti-spin carrier is the same P/N for all available ratios - 2.73, 3.08, 3.23, and 3.42.
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Old September 1st, 2018, 01:28 PM
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Perfect. Thank you sir.
Roy
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