If You have Manual Locking Front Hubs, Then the 4 wheel drive will not work/drive the front 2 wheels at all without, Locking-Them-In . Do Not Lock and use the 4 wheel drive on Dry Pavement.
The Ford locking hubs allow you to manually disconnect the front wheels of your vehicle from the front half shafts. This basically shuts the 4 wheel drive off.
transfer case behind main transmission engages either manually through a lever selected by driver or electrically by switch pressed by driver to a gear set that will transfer torque to both the front and rear drive shafts equally splitting power between the two. front axle engagement can be either manually by locking in hub selector nobs, automatic centrifugal locking hubs, or any other manufacture specific front axle engagement method.
If it doesn't have manually locking hubs on the front wheels, It means it's a "constantly" locked front 4x4. You don't have to lock them, they already are.
The best way to repair an auto locking hub is to throw it away and get manual hubs. You will get better mileage and when you lock them in you know the hubs are locked in.
I am assuming your truck doesn't have front manual locking hubs,since most of the 1/2 ton class of trucks made today buy the most popular manufactures-Ford,Chevy,GMC,Dodge Etc... do not have Manual locking front hubs to engage your front axles like in the past older versions of 4x4 trucks.Some of the larger rated 4x4 trucks 2500,F250 Etc...and up can still use manual locking hubs.This Explains Manual front locking hubs-they are just like it says-you personally have to manually go to the front axle hub and turn the selector from the free position to the lock position 4x4 then when you are driving you select 4 wheel drive from your cab usually a selector lever or push button then the front wheels are given power by the transfer case-which is 4 wheel drive. With the new series of 4x4 trucks they do not have manually locking hubs on the front axles no more.They are direct coupled to the front drive axles which go into the front differential housing then routed to the front drive shaft then to the transfer case. Your front axles and differential,front drive shaft turns when your truck is in motion frontwards or in reverse its a constant.You have control to engage your truck in 4 wheel drive by your selector usually a button you push on your dash or a manual lever coming up from the floor.So when you assume your in 2 wheel drive the only wheels with power is the rear which is correct BUT the front wheels and its connecting partners are still turning even though they are just rotating freely for the ride. Otherwise with MANUAL LOCKING hubs you could push your button or pull your lever to engage your 4 wheel drive and the dash light 4x4 indicator may be on but the rear wheels will only have power --unless you stop your truck and manually go and turn the manual locking hub to the lock position on your front axles. The down side people may have with the inconvience of manual locking hubs you have to get out and turn them in yourself when the weather may be worsening or turn them in and let then in at your leisure,The up side is when they are set to FREE--the only thing turning is just your wheels and tires-the axles and front differential and the front drive shaft DOSEN'T turn-which can save you fuel,wear and tear on these critical componets,less maintenance on the componets of your front end.The down side of having the front axles and differential and drive shaft it does rob you of some fuel mileage and it does wear these componets out faster.The UP side is when you need 4 wheel drive all you do is push your button or pull your manual lever and you have it.Hope you find this helpful--God Bless.
I would say front wheel drive
front
Have your actuator on the front right axle tube checked
The 2004 Chevrolet Impala is a front-wheel-drive vehicle. This means that the engine's power is transmitted to the front wheels, which are responsible for both steering and propulsion. Rear-wheel drive would mean the power is sent to the rear wheels, and four-wheel drive would typically allow the driver to manually switch between two-wheel drive and four-wheel drive modes for better traction in certain conditions.
If you have a four wheel drive I suggest first that you go get a owner repair manual but in order to change to four whell drive with a locking hub depending on the vehicle you must turn the metal bar on the center shaft of the wheel hub. that is the locking mechanism. + you may have one or more other things to do so go pay the thirty dollars for the book before you break the front transmission. or wait for a better answer.
rear drive is better because in this position the clitoris stimulate more.
4 Wheel drive is better. It gives more road surface selection to get the most traction four wheel drive because 4 is better than 2 hands down but front wheel drive is better than rear wheel drive