The next generation of two speed axles used an electric motor to make the shift, I don't know of a conversion kit but there may be something out there. The task force 2 tons and 2 1/2 tons could be ordered with an Eaton rear axle, those were electric shift.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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