My 1997 chevrolet suburban will not go in any gear the fluid level is normal.

As dependable as all the old suburbans must be, they can't defy GM's planned obsolescence schemes forever. I was trying to help a friend keep his '78 suburban's lighting going. It ran great, but looked like half the stuff under the dash had been broken at one time, and patched back together. The wiring was a real colorful mess.
All you can do with the automatics is check the level and condition of the fluid. Never let it run low for long, or it will burn out. If the fluid looks burnt or dark brown, it's probably bad. You would want to have a shop or transmission shop verify or diagnose it to be sure, because rebuilding yours is a huge expense, just as a rebuilt one you could find would be expensive. A used one? You are always taking chances with a used transmission- it's real iffy. Lots cheaper, if you want to roll the dice, lol. Its your call. How fond are you of your suburban? .

Did you check the transmission fluid? Low fluid will prevent the vehicle from moving. My General Motors vehicles recommend the transmission fluid be changed every 50,000 miles.

The power steering reservoir has a dipstick attached to the cap you take off to fill the reservoir, it is written on the dipstick what level is normal. Low fluid will not cause any play in the steering worn parts like tie rod ends and worn steering gear boxes will.

remove the p/s lines to the gear box, take the nut of the pitman arm and seperate the center link of the pitman arm, remove the front shield, remove three bolts from the side of the frame holding the gear box onto the frame, you will need a puller to remove the pitman arm off the gearbox, reverse procedure to install. add fluid.

Check the trans fluid level, if that is good then you will need to have the trans serviced.

gear shifter broke or someone been playing or trying to steal you ride. was it parked on a hill? that could be a problem as well did you check the fluid level before you started it? well start there if not some thing in the trans broke i also assume it is auto if not you clutch is not working

Sounds like the transmission is slipping. Check the fluid level and make sure it is correct. Vehicle warm, sitting on a level surface, running, transmission in Park. The fluid level should between the marks on the dipstick. The dipstick is on the passenger side of the motor, behind the motor against the firewall.

The fluid should be pinkish, and kind of sweet smelling. If it's browish or burnt smelling you have a transmission problem that will have to be looked at by a shop.

Good luck.

check active codes present in the dashboard
check transmission oil level first

You rear planetary set is worn from a restricted cooler.

check your fluid level when the car is warmed up