For most engines there is no need to change the crankshaft to use an engine for an automatic or a manual transmission. For an automatic, connect a flex-plate to the crankshaft. For a manual transmission connect a flywheel.
Are we talking about excessive crankshaft endplay or a damaged flywheel? If its crankshaft endplay, replace the thrust bearings (and torque converter if automatic transmission). If it's the flywheel, replace the flywheel.
In most cases the flywheel is bolted straight on to the end of the crankshaft.
The flywheel is bolted to the crankshaft.
Bolts
flywheel
Flywheel
Its between the crankshaft & the clutch.
Crankshaft directly connects to the flywheel.
It fits into the end of the crankshaft.
few websites i have searched have come back with a flywheel to crankshaft torque spec of 50 ft-lbs same goes for the flex plate in automatic models. pressure plate torque spec is 23 ft-lbs
The Astro does not have a flywheel, it has a flexplate. To remove it you have to remove the transmission so you can unbolt it from the crankshaft.
next to the flywheel but you need to rimove the gear box fast