I also have a 1987 Chevy C70 4x4 dump truck that was previously a firetruck that has a similar transfer case. Any idea whether it might be a suitable replacement if the original goes out? If the axle wasn't so wide it would be a sweet swap into a Big Bolt.

Take care,
George
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1954 Chevy 6400 2-Ton
1955 Second Series Napco 4 x 4 Suburban Carryall
1966 Chevrolet K-10 -- Sold to another 'Bolter