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1998 suburban 1500 4x4 5.7 4l60e np246 push button 4x4 2/4hi/4lo/auto I need some help here. Suddenly my 4x4 quit working on my truck, details above. I have diagnosed everything I can. There are no codes or lights. The issue is no power to the front wheels while in any of the 4x4 positions. The front axle actuator is working, checked with a new one. The encoder motor is new, just installed oem motor. When the truck is on stands the front wheels roll in 4x4 but on the ground they have no torque. I put the front on the ground and jacked up the rear axle, the rear tires spin in drive, the fronts have no pull what so ever. With the truck in the air, 4x4 hi engaged, engine off, truck in neutral, I can roll the front drive shaft by hand and see movement in the rear shaft. Again, when it's in the air everything works, only on the ground it acts like it's still in 2wd. Does the 246 have slipping issues? Is that even possible? I've never had one apart but if there's discs to engage them possibly they are worn? My next step is a xfer case but I don't want to throw any more money away. I should mention I have this problem in auto mode too. Thanks
