Can someone provide me with information on a 12-bolt rear end based on the following numbers? I am wanting to know 1) what type of vehicle the rear end came out of, 2) whether the carrier is a 2 or 3-series, 3) whether it is an open or posi and 4) what gear ratio it contains. The casting number is 3969278NF and the stampings on the front of the passenger axle tube is KDC 153 1. As far as I can tell, the cover has never been removed. I would appreciate any information that you can provide. Thanks!