Here is all tbe castings. I cant figure out what i have. DIF F 77C 35 14 4668 B A12 WAA WAA 8 4025B 35 TEETH ON RING 9 ON PINION
Those are actually considered 3.89 gears. I have no idea what all the casting numbers mean. Why don't you post a few pictures of it?
We're both wrong, they're 3.888888888's HaHa! I think there's 3.91's available for a ford 9" too. Ring gear 43 teeth, pinion 11 teeth=3.909090909