I've never seen a direct drive d6c so I can't tell on that, but I have seen d6b's that only had the tranny and finals stil attached to the frame rails and the transmission looked very similar to the ones used in a 9u.
May look similar but there is no interchange there either.
9U trans case is a 1F4444 RPB 3S2044.
9U has a 12T pinion. D6B has 11T. Pinion end bearings are not the same.
There are other differences although some internal parts do interchange.
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