The Ford parts book SE39-42 only makes reference to GM front axles only for the F15A (C011WQF-3000 A2 GM Cast design, 6.5: gears and C011WQF-3000 B2 Pressed design, 6.5:1 gears), yet makes reference to GM rear axles in both 6.5:1 and 7.2: ratios for the heavier types of 4x4 CMP (C01Q 4000 A 7.2 Cast, C01Q 4000 B 7.2 Pressed, C011WQ 4000 6.5 pressed). It would seem that the GM front axle was only ever fitted to F15As.
The parts book describes these GM axles as having removable housing covers, when it was only the Pressed steel design that had the removable cover. The famous picture below shows an early 11 Cab F15A with the GM Cast front axle.
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