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4x4 on the pre-04 and 04 up are totally different. Pre-04 (97-03) have no hubs to lock/unlock. All is done at the diff. 04 up have IWE's (hubs) that the default position is locked. They are unlocked when in 2wd by vacuum. If your front driveshaft is not turning when in 4x4, then either the motor than engages the TC is not working properly, the TC is bad, 4x4 switch is bad, or possibly the GEM module is bad. If you are getting the 4x4hi light, then more than likely it is the motor or TC.
If it was a problem with the front hubs or solenoid, it would more likely be a problem when in 2wd with the front hubs making a grinding noise.
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