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remove the transmission first
( keep the torque converter with the transmission as a unit ) use an impact gun , remove the crankshaft bolts for the flex plate making you keep the washers in the correct order for the new plate
fit the new plate
To replace the flex plate you should purchase an inexpensive repair manual first off, then purchase an inexpensive tool set with Metric sockets and wrenches. You will need a good jack and good blocking or jack stands to hold the vehicle up while you perform the task. Basically you must separate the engine and transmission move the transmission rearward far enough to reach the bolts which attach the flex plate to the engine. once you have the bolts removed and have matched a replacement flex plate you will need to torque the bolts back into the crankshaft and then reverse the procedure used to remove the transmission. It is a pretty big job but can be performed by a diligent worker with minimal experience following basic instruction from a simple manual. If you have a library near you you may be able to find a repair manual to outline the procedure.
Above all be safe when working under a vehicle so as not to be squished to death. A transmission jack may be helpful but may not be necessary if you have good stable blocking with which to support the transmission while allowing you to move it rearward away from the engine.(rear wheel drive only) This is not a super technical job but will require hard work.
An automatic doesn't have a flywheel, it has a flex plate instead. The torque converter makes it act a lot like a flywheel, though.
But... you're probably talking about the flex plate or the ring gear around its edge. This is going to require removing the engine from the vehicle - there's no other possible way to get the flex plate out.
Once the engine is sitting on the shop floor, it's a simple job to replace the flex plate - first you unbolt the torque converter and set it aside, then you unbolt the flex plate from the crankshaft. Bolt the new flex plate onto the crankshaft, bolt the torque converter to the new flex plate, and put the engine back into the vehicle.
Check for failing harmonic balancer (rubber failing between hub and pulley). If auto drop the inspection plate and check flex plate for cracks and loose bolts.. If it is a .knock remove plug leads one at a time and find when the noise is less and that will be the big end or main failing.
you can try to buy new fly wheel or flex wheel at a auto parts stores but more likely dealership part.reason for flex plate to cracked due to stress and heat or starter bolt breaks causing starter hit flex wheel.
sounds like it is incorrect flex plate
for bolts to keep coming loose i wouldsay the bolt threads in end of crank have been streched thru over tightening
you may be able to redrill and tap these
to do this you will have to pull engine
you alsocannot weld craCKS IN A FLEX PLATE
FLEX PLATES flex THEREFORE WELDING IS A WASTE OF TIME
WELDING WILL ALSO PUT FLEX PLATE OUT OF BALANCE WHICH AGIAN WILL CAUSE CRACKS AND PROBABLY WAS THE ORIGINAL PROBLEM TO START WITH