Can someone help ID the posi by year car and model? It's a 3:90 - 3:91 by revolution calculation and the markings are as in the title, 402227, either OFD4 or CFD4 on the main housing with an upside down T3 on the passenger side tube. Thanks in advance,
Joe

 

It's a 68-69 T3 3:91 posi rear.Cutlass,442 12-bolt O-axle.

 

Brian,

Thanks! That's what I was hoping. Now after I get the car running, just bought it, owner says hasn't run in 10 years, we'll see what kind of shape its in. Eventually I'll pull it apart and service it.

R, Joe

 

If you pull the axle shaft you will see if it is a 68 or 69
sealed bearing with the seal in the axle tube - 1968
oil bearing from the center section with the axle/ wheel seal on the axle shaft out board fo the bearing it is a 69 -70 rear.

Jim
JD

 

Jim, Thanks!