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- Fri Dec 14, 2018 1:53 pm
- Forum: 12 Bolt Differential Questions
- Topic: Olds Type 'O' casting date
- Replies: 1
- Views: 8707
Olds Type 'O' casting date
]Hello Mr. Jim. I have a Oldmobile 12 bolt Type O posi rear end with TO stamped on the back passenger axle tube. I took off the cover and found 588 on the posi,which I take it to be 28 spline. The gear ratio is 3.91 from what I found on the ring gear,11A43. The housing has 402227 with CFD 4 cast nex...