Let’s talk about the 8-1/4” diff

Kern Dog said

I really doubt that. First, the 400 and 440 went away after 1978. EVERY 1/2 ton 440 truck that I have seen has had the 9 1/4" axle.

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I owned a 1977 1/2 ton 4WD with a factory 440 that had an 8.25 in it. Truck was all original. And I looked at another one that was ordered new that was very similar with an 8.25 in it. I, like you, was surprised there wasn’t an 8.75” in either of them. Ma Mopar did some weird stuff at times!!