I have a 1992 Crown Victoria. When I am backing

Is there fluid in the power steering pump reservoir ?

I'm thinking they were hub Assembly's ...
If that's the case then remove tire
Axle nut
Caliper bracket, rotor
Andfew bolts holding hub on...

probably over turning and locking the pump......have you put on bigger tires?

Sounds like the lower balljoints are dry. One could try to grease them. But more than likely you'll need to replace them.

You probably have a loose front end part.And could have a tire out of balance.

Alignment has alot to do with the tires not shimmying.. Like zero toe setting. Loose componants like tie rod ends and the idler ar worn. You can ck for excess front end play by holding the front and back of the wheel and pushing and pulling on it, like rocking it. OR have someone rock the steering while you watch where the play is from underneath. By rocking I mean turn the steering wheel back and forth. Look at all th joints and pivot points for excess play, which is, movement not immediate to the rest of the steering system. Tire balance is very important. Wheel hop is a sign of a bad tire and it overtaxes the shock absorber. Shocks don't cause shimmy because they are a vertical movement controlA shimmy is lateral or side to side.Wheel balance weights must be spit. If a 2 oz. weight is needed to balance the tire, Oe once should be on the inside of the wheel and one ounce on the outside directly across from each outher.. Loose wheel brgs will cause shimmy, but they would not last long. Caster setting on the wheel alignment will also cause shimmy. Like on a shopping car. too much caster causes the wheel to start fluttering and is very hard on other componants. This may be why you have worn tie rod ends and a bad pitman arm. Worn control arm bushings and ball joints directly affect titre wear and can only be feltwhen the front end hits a dip and detected by side wear on the tire edges. Summary: replace the tie rod end and have the car aligned. Good Luck, -Ned_ sorry about the book

Have the technician replacing the tires put the best 2 used tires on the rear of the cars and put the new ones on the front. You do your steering and braking with the front tires and if you were to have a blow-out, you want it to happen on the rear tires so that you can maintain maximum control with the good front tires.

change the sensor on that wheel

What rims are on the car the steel police ones and what tires are on it could be hitting the stops on the frame and where the proper bolts put back in on the rack mounts and did you go with the heavy rack for the police car .Cause when I built them there was an issue with the proper bolts and there was a different rack for the cop cars the to the basic crown vic do to the suspension upgrade on it and the diffrent pump

salvage yard would be your best bet