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XLT should have the 9.75 rear end. FX4's have the larger size. The sticker on the door will tell you what axle size you have after you decode it. I beleive it's a letter that you need to translate to a number.
4.6 2v motor = 8.8 axle
5.4 3v motor = 9.75 axle
5.4 3v motor with Heavy Duty package = 10.25 axle (7 lug)
what does your door sticker say in the axle part? that part is what tells you whether you have a 3.55, 3.55LS, 3.73, 3.73LS, or 4.10 (heavy duty only) gearset
Thank you for the info It turned out to be an 8.8 with 3.73 now could anyone tell me if 2008 axle shaft will fit into a 2001 f150 rear end . Other then the 5 lug to six lug. I know where I can get a new rear end rotor to rotor from a 2001 f150 from a closed dealership. would need to change axles for the six lug, or did they change the bearing size. Thanks "Tank"