Been doing some thinking about what to do with my XL-7 rear axle. I now have 31's on and need to regear( well not realy I still can pass people doing 70

would like the power back thou) but guess what ..... no one makes higher gears for the xl-7. :-/ So here's what I was thinking about doing: getting a GV rear, sidekick 3rd w/5.8 R&P(which I know will work together) pull the gv axles out and swaping in the XL-7 bigger axles. (this is where things start to get fuzzy) Now it's my understanding that the GV and xl-7 are all most the same. What's differnt the spline count on the Xl-7 is higher and the splined end is not tapered down = stronger axle
So all this just sounds too easey What am I missing
George