Chevy made some P-30 (I think) bread delivery trucks that used a 4cyl. Cummins 4BT turbo diesel. They mated it to a standard Chevy trans (700R4). Guys mate them to an Aisin AX-15 5 speed tranny's for their Jeeps as well.
Don't know if it fits into S-10's. You would probably need to run the smallest gears possible in your rear end & probably bigger tires to maximize Fuel Economy.
Don
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