Manual 3-speed overdrive

Mark Nixon said

Pick-ups and vans had cast iron ones until at least 1982, but they are long shaft, like B+E bodies.

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FWIW, the long tail shaft A833OD that I have in my 68 Barracuda came from an 80 D100 pick-up and it has an aluminum case. Several others from the same time frame in pick-ups and vans that I have looked at in the local bone yeards also had aluminum cases.