Alright, I've never taken a differential apart. I want to put better gears in my 10-bolt; not sure I can afford to go 3/4 ton right now or anytime real soon but I'm running 2.73 gears with 33" tires and a 700R4 tranny. NOT an ideal situation, and I'm putting a plow on the truck for the winter. I want to call around looking for gears but I need to know, do the axle splines affect anything? I think they do. I have a 30-spline axle. Does that limit the years and models that I can get the gears from? Any advice would be greatly appreciated.