Automatic vehicles does not have a flywheel, it is called a flex plate that is bolted onto the cranck shaft and onto the torque convertor.
The easiest way is to put the transmission on its tail standing it upright taking care not to damage the sael at the back and than slowly lowering the torque convertor down on the shaft turning it at the same time to make sure that it engages in all the different splines in the transmission.
If the flex plate is broken it means that something caused it to break, make sure the transmission is in good condition and not jerky when you drive.
Also make sure that the bolts that holds everything together is propperly torqued, loose bolts can also cause the flexi plate to crack and than eventually breaks
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Try using an impact socket on the balancer bolt, with a 3/4" Johnson bar and a long steel pipe for leverage. If that doesn't work your only other option may be to remove the heads, spray WD40 all around the edge of the pistons, then place a piece of wood like a 4 x 4 on top of each piston and give it a few really good hits with a heavy hammer, that may free the pistons enough so you can turn the crankshaft.
Basic . remove drive shaft. remove rear engine mount after supporting gear box on mobile jack and engine ,with blocks under sump undo gear box bolts and if the starter motor is involved . remove the terminal from the battery first. undo the slave cylinder of the bell housing / cable if applicable. pull the gear box to the rear . remove the pressure plate bolts by going around the plate a little at a time . Lift the pressure plat away and catch the clutch plate as it falls out. Make sure that you see the way the clutch plate goes in as if you install the new one incorrectly you will be pulling the box again. check the spigot bearing / bush in the rear of the crank shaft and if faulty or worn replace it . check flywheel face and if you want a good job then have it re-machined to flat again . Follow tensioning procedures when replacing the flywheel. put the clutch plate in position and use a clutch aligning tool to ensure that it is centred. AT this point if the plate is in correctly you should be able to hold it against the flywheel and turn it freely without the hub hitting on the fly wheel bolts. fit the new pressure plate and do the bolts up in the correct manner to the tension specs. . Replace the throw out bearing on to the housing in the throw out fork. Remove the clutch aligning tool ( tap with hammer if it appears jammed ) refit the gear box and associated items in reverse order of removal.
the ring gear on the fly wheel may have damaged teeth or not have the right gear teeth count to be compatible . Pinion teeth have to match the ring gear teeth or they have trouble meshing and that makes it hard to turn over. If the ring gear teeth have been damaged then the gear box will have to come out to get the fly wheel / flex plate off. If it is auto then it is a simple matter of replacing the flex plate . But if manual the ring gear is removed from the flywheel and a new one fitted. Most accredited service shops can do this operation. count the number of teeth on the ring gear and the number on the starter pinion and take the figures to an auto electrician and he will know it they are right.
this happens because the clutch plate is still spinning with the fly wheel. If you have just replaced the clutch it will be because the clutch plate is in the wrong way and the hub is hitting on the fly wheel bolts. If you haven't touched the clutch so far then you will have to check that the clutch slave cylinder is moving the throw out arm or if the pivot has broken off. IF that is ok then there is a case of the fly wheel and clutch plate contaminated with oil and sticking
together or lastly the lining of the clutch plate has become un secured (broken) and jamming on the flywheel/pressure plate. I am betting on the plate in the wrong way round.
A long and difficult job best done on a hoist. The transmission and transfer case are quite heavy so a gear box jack is the order of the day. Remove drive shafts at the gear box and transfer case . Remove the gear lever and any wires/hoses to the box. Undo the bell housing bolts and take the weight on the transmission jack. Take care here as the gear box/ transfer case will tend to turn and fall off the jack. Finish removing the bolts and full the unit back out of the road. Un do the clutch pressure plate bolts evenly and remove the pressure plate and clutch plate . The clutch plate only goes in one way so remember which way it was facing when you take it out. Remove the spigot bearing/bush from the crank shaft and fit new one . Check that the fly wheel is smooth and any blue spots and burn marks will have to be machine out so it will have to be removed as well for the machining. When all is done replace the fly wheel /clutch assembly . Replace the throw out bearing and prepare to refit the transmission. Yes you can take short cuts but it will result in a jumpy/ shuddering clutch and you will have to do it all again.(extra dollars and time).replace the clutch and pressure plate as a unit and not one or the other. It will take about 6 hours of work but it should be a good job to last a long time.
You are refering to the teeth part known as the ring gear. It usually wears in 2 places ad in te old days we used to heat the ring up to release from flywheel and turn it 90 Deg and let cool and refit. Just as easy to get new flywheel these days
it can do the pinion may be worn, take off the motor and see! do it now beause it might be the ring gear, you see if you ahve a bad pinion then it will dammage the fing gear! if the ring gear is dammaged... you can replace starter,, It may seem fine, but the dammaged ring will grind up the new starter's pinnion, once the ring gear is dammaged then it is gear box out! so look now to avoid more lenghty and expensive repairs!! Have a nice DAy........Bruce.
is it an auot box? if so have you diped the atf fluid latley? if its very low that could do it? if its a stick shift it could be the starter or the ring gear slipping on the fly wheel worst thing i can think of is broken drive plate on an auot box or even a broken crank shaft?