There is Zero electronic on the AWD system, You can pull the front axle and try to drive it but you won't get far before burning up the viscous clutch in the TC. both axles have to be on the ground. it would be like having a rear diff with no spider gears in it. the viscous clutch in the TC is kind of like a Quafi unit so try to think about it as a very smart posi unit. it has to have both front and rear output shafts on the ground. so when the viscous clutch in the TC senses the front axle starting to speed up over the rear axle it thinks it's spinning so the viscous clutch start to engage and transfer more power to the rear axle and visa versa. it's almost as good as the Subaru system. it's just that the front diff in the GM is the weak link and prone to fail. I'm not an expert by any means. I was ASE certified for close to 20 years until an injury put the brakes on that for me. Then I was a commercial drive until 2010 and went on disability. I love the car, I love working on them, but after 2 failed back surgeries and one 2 level fusion I don't get to do as much as I once did. Doing my swap on my Denali was the first big thing I've done in years. I miss it but the physical issues keep preventing me from doing what I love. So it takes me all day to change the oil, at least I still want to try.