You can change model year 2007 to a range from 2002 to present model year.
On the work van that I drive, there is a W indicating it is non - limited slip 4.10:1 axle ratio. Exactly what is needed in that E250 van with the smaller 4.6L V8 and really tall overdrive, that limits the engine speed while in overdrive.
So look at the driver's door, and there should be a letter indicating what axle is installed, but no chart to show what axle it is. You have to look that up on the internet or from the dealer.