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Please help I.D. these G.M. rear gears

Guest alley oop

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Guest alley oop

The o.d. of the ring gear is9.485 (probably known as 91/2) i.d of it is 6.020. The inner (large) pinion bearing shaft size is 1.875, the outer pinion bearing shaft size is 1.375. It has G.M. # 14012766-11 41 5-86 stamped on the ring gear. It has 12- 7/16 NF bolts on ring gear. An old mechanic said these are probably Olds gears. 3.73 is the ratio, but thats all I know. Thanks for your help guys

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