A friend of mine has one, and I was wondering if it had the 31 splines, and what the gear ratio was?
That article is incorrect. All Mustangs (excluding specialty models which I can't say for certain) up until the S197's came out had 28 spline from the factory. The V6 uses a 7.5" rear end, not an 8.8 and it was also 28 spline, but came with a 2.73 rear gear. I've had a dozen or so SN95 Cobras and every one of them had 28 spline from the factory.
1fafp4045yf134386That's impossible. The VIN number doesn't contain any information about the rear axle assembly. See the site below for an example of how to decode the VIN number.