i have written earlier about how my 4x4 wont engage on my 96 jimmy with push button 4x4. i jacked up the jimmy and found that when i push the 4x4 button, the front axle will spin but will not power the wheels. after further investigation, i found that the front axle will spin all the time, in 2wd an 4wd. can anyone tell me if it is supposed to do that, and why i am getting no power to the front wheels in 4x4? thanks