W100 were all 8.75 till 74. At least Early 74. I've come across a couple guys that claim there's is a 74 but Full-time 4wd So I assume they swapped mid late 74 in w series. but D100 73 had 8.75 and 8.25-8 3/8 possibly 9.25. My 73 Clubcab was a 8.25 if I remember correct. Not a 8.75