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You aren't getting power to the front wheels?
 

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Natosha,

Help out the folks who are here to help you.

Do you have manual locking hubs on the front wheels that is not locking the hubs to engage your 4 wheel drive or is it the knob on your dash that is not engaging the 4 wheel drive?

Gary
 

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Understanding that you have manual locking hubs on the end of the front axle and you are NOT able to twist to lock the hubs to get power to the front axle, usually means that dirt and/or water has entered the hubs and made them inoperative.

The hubs would then need to be taken apart and cleaned, properly lubed and re-assembled.

If you are saying that the knob on the dash does NOT engage the front axle hubs, that usually indicates that the "vacuum supply" is not present for the hubs to automatically lock from the dash switch. Usually this can be caused by broken vacuum hoses and/or a bad vacuum pump.
 

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It's on the front of the truck
Yes, we understand that. I think there is a communication barrier here. The 4x4 on these trucks are engaged either electrically with the knob on the dash, which then uses vacuum to engage the hubs, or manually via the shift lever, and then the driver goes out and turns the hub locks on each front wheel. With the knob on the dash, yours SHOULD engage automatically, unless 1. the switch on the dash is bad, 2. there is a vacuum leak, 3. the hubs are bad. (there may be more reasons but those are the ones that come to mind). It is possible that someone changed out the hubs to manual types, too. So, if you turn the knob to 4x4, and the hubs don't engage, then turn them to locked and see if that does it.
 
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