I have a 2004 f 150 the four wheel drive will not completly engage

There could be a few possible causes for your 2002 Chevrolet Tahoe not going into four-wheel drive when you engage the system. Some common issues include:

The four-wheel drive system may not be properly engaged. Make sure that the four-wheel drive switch is in the correct position and that you are following the proper procedure for engaging the system.

The four-wheel drive system may be mechanically damaged. This could be caused by a problem with the transfer case, the drive axles, or other components of the system.

There may be a problem with the four-wheel drive system's control module or other electrical components.

There may be a problem with the four-wheel drive system's vacuum lines or other mechanical components.

To troubleshoot the issue, you can try the following steps:

Check the four-wheel drive switch and make sure it is in the correct position.

Check the four-wheel drive system's control module and make sure it is functioning properly.

Check the four-wheel drive system's vacuum lines and make sure they are not damaged or disconnected.

If the issue persists, it may be necessary to have the vehicle inspected by a qualified mechanic.

If you are not comfortable performing these steps, or if the issue persists after trying these troubleshooting steps, it may be a good idea to contact a mechanic or a Chevrolet dealership for further assistance.

it sounds like the front differential is not engaging, check the solenoid on front diff.

hi
yes seems like you switch is faulty.]
replace the switch
Thanks

problem cv joints and or "U" joints and or worn slip joints in drive lines
no make model year listed so impossible to know exactly

Sounds like you have a bad switch.

the auto 4 wheel does the same as part time in jeeps, it engages only when the vehicle loses traction. when auto 4 wheel is on the truck isn't fully in 4 wheel drive. my 02 sierra makes the clunk noise too but it does engage. try checking your fluids, i know its way pass the time for me to change mine out.

See vacume pipes at the front wheels. sound like it is broken or pulled out by snow. there is 2 pipes one for brakes on calliper and one for vacume suction to engage or dis engage 4 wheel drive. Enjoy. Willem SA

Check the fuse for the four wheel drive before taking another step,it is electrically engage,hope that help you and clear your mind

Sounds like you either have a vaccum leak or your 4 wheel drive actuator is not working to engage the front differential.On my 98 ram there is a black and red plastic lines that are used for the vaccum lines. They are underneath and go from the transfer case to the front axle, check to see if one or both might be cracked or broke completely.If the lines are good then it could be your actuator on the front axle. A new one is about $93 at advance auto parts and not very hard to replace

you need to also check the relays that are in same circuit