What makes my sebrig squeal went I put it in reverse and move car.

Check for metallic contamination on the ABS sensors behind the hubs. Also, check to see if your parking brake is hanging up.

sounds like rear end is coming apart
google wrangler forums and post there

This is probably the wear indicators on the brake pads,pull the wheels and take a look.(Toyota also designs the pad wear indicators to work in reverse,so they will continue to squeal louder and louder as the wear increases.)

Can you disconnect the shifter at the transmission and move the shift arm ? Make sure the parking brake is set first.
You may have to disassemble the steering column to un-jam the key cylinder and shifter.

you have got some serious drivetrain issues but please inspect the cv axles to make sure there not getting hung up somewhere

Beveled the pads in the reverse direction around 45 degree angle

check power to the reverse shift solinoid

Hello!

1. Open the trunk by using the driver's side trunk release latch or by manually unlocking it.
2. Peel back the trunk liner to expose the wiring connector and taillight housing plastic retainers.
3. Disconnect the wiring connector, loosen the plastic retainers and remove the taillight assembly from the car.
4. Twist the turn signal bulb socket counterclockwise to remove it from the taillight assembly. Then, pull the malfunctioning bulb straight out of the socket.
5. Insert the replacement bulb directly into the empty socket and then twist the socket back into the taillight assembly.
6. Reinstall the tail light assembly.
7. Activate the turn signal to make sure it's working. If it lights up, fasten the trunk lining back into place and close the trunk

your linkage on the transmission must be off. try having someone move the shifter while you watch the linkage arms under the car on the trans to make sure its all intact. it could be a loose or broken bolt on the trans causing it to not disengage from reverse this will cause it to not start.