1991 trooper. We transplanted a 3.1 Isuzu bighorn diesel with a 5 speed trans into this truck. I rebuilt the engine recently,there are less than 100 miles on engine. brand new cylinder head, ew turbo, ings, earings, lock heater, ew clutch, tarter, lternator and vacuum pump. New front brake pads, ear pads, otors, alipers, uperwinch lock out hubs.ac works. Custom built stainless exhaust. Body and frame are solid.we just put new fenders on it. This trooper runs great and gets 28 mpg on highway. Interior is in great shape. This trooper is originally from Washington state. You wont find another trooper like this one. I also have an 86 trooper diesel chassis for parts.