i agree that it looks like a 7.5, itd be kind of nice to get a 3.91... im going to assume that since theyre both 7.5", the gear sets are interchangable?
i think a 3.9 would be a nice split between 3.7 and 4.1, but would it make any real difference in performance, or is that just wishful thinking?
I have a 3.91 sitting in my garage taking up space if you want it. It was making a good bit of noise when I pulled it out but I'm sure it can be rebuilt. If you want it it's yours, if not I'm donating it to school.