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You don't, because an XF Falcon doesn't have rack and pinion steering. It has a steering box.
Steering boxes can be tricky to adjust. Takeit to a garage or dealer.
There is no adjustment.
The steering box is not meant to be adjusted. This is dangerous as it can lock up unpredictably. If it is worn out get a replacement.
You should NEVER have to adjust a new gear box. You have other front end problems that are worn out.
Under the RHS of the steering wheel, next to the hood release
I just looked this up online and found a pretty good website. Although I havnt tried to do it yet on my own corvette I probably will within the hour http://www.diynetwork.com/diy/ar_1962_corvette/article/0,,DIY_13704_2278440,00.HTML this is the URL as well as some of the directions from the sitethe next step in this restoration is to adjust the Corvette's steering using the steering-box located underneath the hood. An earlier test-drive revealed that the steering wheel exhibited some play during driving. Since the other steering components have been checked and found to be in good shape, the play may be due to wear in the gears inside the steering box.The Corvette's steering box permits adjustment of these gears, which may well solve the steering problem. Adjustment of the steering requires two people, but the job can be done in just a few minutes.The steering box is unlocked using an open-end wrench and a screwdriver extended through a factory hole in the fiberglass body. To adjust the steering, unlock the nut with about a quarter-turn, then adjust the steering using a slotted screwdriver (figure H).As one person sits in the drivers seat and turns the steering wheel in slight increments, another person can adjust the steering (figure I) until the excess play is removed.Important: Avoid over-tightening the steering-box mechanism, as this may cause binding of the steering.
behind the cover under the steering wheel and hand brake area
The 94 Thunderbird does not have a steering box, it has Rack and Pinion steering and most likely your tie rods are shot. The T-Bird has and extremely sharp turning radius and is known for being hard on steering components .
The adjustment is on top of the steering box. Loosen the locking nut then tighten the bolt lightly. Over tightening will cause the box to be too tight.
It could be worn tie rod ends, if not then you need to check the steering box. The worm gear could be worn and you can adjust it with the nut on the steering box.
If the gearbox is causing freeplay in the steering wheel, then the gearbox needs to be replaced.