The only differences I know of on an 8-1/4, is that the 97 up units have 2 splines different from the older ones, I believe that the axles are 27 count on the up to version, and 29 on the after version. ( could have the numbers and years used flip flopped) I had never heard of different size carrier bearings on an A body rear vs an F body one.
Yes, if you originally had a 2.26 or a 2.45 ratio, they had their own special carrier, but from what I remember if you have a 2.71 or higher(number) ratio you should be good to go. Now if yours is an 89-96 SG that is set up with an exciter ring to be used with ABS itll still work as long as the spline count for the axles jives. That exciter ring does come off and I think (Im not looking at mine right now) mounts on the opposite side of the carrier flange from the ring gear.Mine was set up for the exciter ring but had no prob putting it into a '78 housing. The exciter ring looks like a smaller version of a flywheel ring gear that the starter engages into. You might call a place like Randys Ring&pinion or National Drivetrain, both are very helpful on compatibility issues like this.
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