I have a 1984 LTD with locking hubs on the tires. The key is lost how do i get the hub off?

On the web:
images for locked wheel hubs

In the glove box should be a card with the ID information on which "colored" key needs to be ordered from a GM dealership. Otherwise you can go to a "parts" place, such as O'Reilly, NAPA, Big A, etc., and rent a universal removal tool to remove the bolt. Make sure to install a regular bolt back in when installing the cap or you will get a rattle and the hub caps will come off very easily.

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Warn Hubs Installation
A truck or SUV with a four-wheel drive suspension uses locking hubs on the front wheels to engage or disengage the front axle shafts from the hubs. This way, you can drive the truck normally with just rear-wheel drive, or engage four-wheel drive mode when you want to drive off-road. These hubs can wear out, and one improvement is to install a set of Warn hubs. Installing a set of Warn hubs takes about an hour.
1.Park the truck and put on the parking brake. Lift the front of the truck with the jack and put the jack stands under the front axle. Take off the front wheels with the tire iron and put them to the side.
2.Disengage the locking hubs using your hands by turning the knob on the hubs. Remove the snap rings holding the hub locks in place with the snap-ring pliers. Pull the hub off the axle.
3.Install the lock ring wheel from the Warn hub kit in the axle with the factory snap ring and the snap-ring pliers.
4.Make sure the Warn locking cap dial is turned to the "Free' position. Install the locking cap onto the lock ring wheel and hub body with a hex-head key. Reinstall the front wheels with the tire iron and lower the vehicle off the jack stands with the jack.
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Reymond

First off do you have manual hubs or auto hubs. is the stick on the floor or is it push button?? Kinda sounds like if it is manual hubs you have to lock in then they are not locking in to give that tire power, you can get new hubs from a parts store but i suggest you to get the WARN hubs do to they will last longer than stock hubs..

Your hubs may not be locking. With your hubs in the locked position, raise the front tires off the ground, manually rotate each front tire and see if the axle connected to the tire spins along with the tire. If not your hubs may not be locking the wheel to the axle. Good luck.

Automatic Locking Hub

1. Shift transfer lever to the ``2H'' position, then move vehicle forward and rearward approximately three feet.
2. Raise and support vehicle, then remove wheel and tire assemblies.
3. Disconnect brake hose from caliper.
4. Remove caliper locking bolt.
5. Rotate pad assembly upward then remove pad retaining clip and caliper assembly
6. Remove brake pad support bracket.
7. Remove hub cap retaining bolts, then the hub cap, Fig. 15.
8. Remove housing assembly, snap ring and shims.
9. Remove drive clutch assembly, inner cam and lock washer.
10. Using tool J-36827 or equivalent, remove hub nut.
11. Remove hub and disc assembly.Manual Locking Hub
    
    
    1. Shift transfer lever to the ``2H'' position and set free wheeling hub into Free position.
    2. Raise and support vehicle, then remove wheel and tire assemblies.
    3. Disconnect brake hose from caliper.
    4. Remove caliper locking bolt.
    5. Rotate pad assembly upward then remove pad retaining clip and caliper assembly
    6. Remove brake pad support bracket.
    7. Remove housing assembly retaining bolts then the housing assembly Fig. 16.
    8. Remove snap ring and shims.
    9. Remove body assembly and lock washer.
    10. Using tool J-36827 or equivalent, remove hub nut.
    11. Remove hub and disc assembly

I would remove and clean the internal parts. They tend to get filled with all kinds of road debry from age and will hang up inside till cleaned and regreased

Remove tire and remove the two bolts to the caliper remove caliper install new rotor, using a clamp and a socket push the system back all the way position. Install brakes and caliper make sure everything is tight and reinstall tire.pump up the brakes start car pump up breaks again until light goes out.

With Automatic Locking Hubs

1. Raise the vehicle and install safety stands.
2. Remove the wheel lugnuts and the wheel and tire assembly.
3. Remove the retainer washers from the lugnut studs. Remove the automatic locking hub assembly from the spindle.
4. Remove the snap ring from the end of the spindle shaft.
5. Remove the axle shaft spacer
6. Being careful not to damage the plastic moving cam or thrust spacers, pull cam assembly off the wheel bearing adjusting nut and remove the two plastic thrust spacers from the adjusting nut. CAUTION: Do not pry on the plastic cam or thrust spacers during removal. Prying may damage the cam or spacers.
7. Using a magnet, remove the locking key. NOTE: If required, rotate the adjusting nut slightly to relieve pressure against the locking key, before the key can be removed. CAUTION: To prevent damage to the spindle threads, look into the spindle keyway under the adjusting nut and remove the separate locking key before removing the adjusting nut.
8. Loosen the wheel bearing adjusting nut from the spindle using a 2-3/8 inch Hex Locknut Wrench T70T-4252-B or equivalent.
9. While rotating the hub and rotor assembly, tighten the wheel bearing adjusting nut to 47 Nm (35 ft lb) to seat the bearings. Spin the rotor and back off the nut one-quarter turn (90 degrees).
10. Retighten the adjusting nut to 1.8 Nm (16 in lb) using a torque wrench.
11. Align the closest lug in the wheel bearing adjusting nut with the center of the spindle keyway slot. Advance the nut to the next lug if required. Install the separate locking key in the spindle keyway under the adjusting nut. WARNING: Extreme care must be taken when aligning the spindle nut adjustment lug with the center of the spindle keyway slot to prevent damage to the separate locking key. The wheel and tire assembly may come off while the vehicle is in motion if the key is damaged.
12. Install the two thrust spacers and push or press the cam assembly onto the locknut by lining up the key in the fixed cam with the spindle keyway. CAUTION: Extreme care must be taken when aligning the fixed cam key with the spindle keyway to prevent damage to the fixed cam.
13. Install the axle shaft spacer.
14. Clip the snap ring onto the end of the spindle shaft.
15. Install the automatic locking hub assembly over the spindle by lining up the three hub assembly legs with three pockets in cam assembly. Install the retainer washers.
16. Install the wheel and tire assembly. Install and tighten lugnuts to 135 Nm (100 ft lb).
17. Make sure the final end play of the wheel on the spindle is 0.00-0.08 mm (0.000-0.003 inch). the maximum torque to rotate the hub is 2.8 Nm (25 in lb).
18.