i also have the w59 but mine is a 4x4 and it is manual shift as well as it has 2H 4H and 4L so if i was going to do something with an electric motor where would i put the motor? on the front side of the t-case going to the front axle or? and if so would i still be able to use my four wheel drive with just my gas engine? im confused as to how you are thinking of pulling this off would it look like this? would the x be the electric motor if the capital I's are driveshafts the E is the engine and tcase is your transfer case?
......................0--------0
.........................I.....E
.........................x....T
.........................tcase
...............................I
...............................I
...............................I
.......................0--------0
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