I have a 99 gc with quadratrac II and have noticed that the full time does not perform well form a cold start. I have assumed that the "fluids or hydrolic system" needs to warm up to operating temp before the full time will work well. After driving only a mile I see a marked improvement in traction. At the same time if I shift into part time I recieve solid traction even from a cold start. All of this is when starting cold from my driveway turning onto a snow covered 7% grade road. To test this I have tried driving out of my driveway immediatly after returning home in full time.
jimo