Flex plate is the term for a flywheel mated with an automatic transmission.
REMOVAL & INSTALLATIONAll Engines
The ring gear is replaceable only on engines mated with a manual transmission. Engines with automatic transmissions have ring gears which are welded to the flex plate.
- Remove the transmission and transfer case.
- Remove the clutch, if equipped, or torque converter from the flywheel. The flywheel bolts should be loosened a little at a time in a cross pattern to avoid warping the flywheel. On Jeep vehicles with manual transmission, replace the pilot bearing in the end of the crankshaft if removing the flywheel.
- The flywheel should be checked for cracks and glazing. It can be resurfaced by a machine shop.
- If the ring gear is to be replaced, drill a hole in the gear between two teeth, being careful not to contact the flywheel surface.
- Using a cold chisel at this point, crack the ring gear and remove it.
- Polish the inner surface of the new ring gear and heat it in an oven to about 600°F (316°C). Quickly place the ring gear on the flywheel and tap it into place, making sure that it is fully seated.
Never heat the ring gear past 800°F (426°C), or the tempering will be destroyed.
- Position the flywheel on the end of the crankshaft. Torque the bolts a little at a time, in a cross pattern, to the torque figure shown in the Torque Specifications Chart.
- Install the clutch or torque converter.
- Install the transmission and transfer case.