Hi Leigh
Your 2000 Ford will be a 10.5" rear. The early 1986-93 are the 10.25" short pinion. The 94-97 are the 10.25" Long Pinion and 99 and newer ate the 10.5".The actual axle housing are the same casting and all gears can be swapped around as long as the yoke and bearings are used with the proper gear set. Thank You