You might get a lot of slamming into and out of gear. Not sure with the AWD though since you already have 35% of your torque going to the front. What is likely to happen is you will steop on the gas, your transfer case will think that your rear is slipping since it is turning much faster than your front so it will start directing more power to the front. Once it gets 50% of the power to the front, your front and rear will be turning the same speed, so it will start backing off the power to the front which will start the process all over again. I think the AWD is smoother in its actions than the Auto 4x4 on my Controltrac so you might not notice it. On mine I could just put it in 4x4 high with the rear disconnected. That would prevent it from constantly slipping and engaging.
Be aware though that your front axle is much weaker than your rear axle. It is not meant to pull the entire vehicle. If you do it, go easy on the throttle. My front driveshaft is connected to my front differential by 4 5mm bolts on the caps that hold the U-joint in. My rear is held on my 4 10mm bolts.
