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They have a couple of different ratios, as when I took apart a 76 NP 435 I discovered a couple of the gears inside had one less tooth than the corresponding gear in the NP 435 in my 78 F-150.
First is always in the 6.5:1 range, though, reverse is just a little less steep.
fordmando
70 F-100 Ranger XLT 400 C6
78 F-150 4x4 400 4 on floor
George