Spline count in the sure-grip is different on the newer stuff. I don't know that there is much difference in the gears alone.

I will say however, that setting up a ring and pinion properly is a job. I'd look into the local 4x4 shop. They do it all the time. I know a guy who does several vehicles a week front and rear.

It is possible to do yourself, but it is pretty crucial that you get things right.

ROB