so I'm the OP and still confused. Trying to figure out if the rear was original to the car - or a possibility. With the 3.91 included in the A31 package is it safe to assume it was a SG. Whatever is in there now is in a 741 case and not a SG. What is the most likely case for a spring special A31 3.91 gear ?
As Dr. Diff said... 3.91 with sure grip, in a 489 case, in an A31 B body, not a 741 and certainly not OPEN with 3.91's.
What is in the car right now was not installed by the factory when the car was built.
