Heavy Knock Hot With Torque Applied

^ Broken balancer or pulley hub; Replace the parts as necessary.
^ Loose torque converter bolts; Tighten the bolts.
^ The accessory drive belt is too tight or nicked. Replace the drive belt as necessary.
^ The exhaust system is grounded. Reposition the exhaust system components as necessary.
^ The flywheel is cracked. Replace the flywheel as necessary.
^ There is excessive main bearing clearance. Replace the main bearing(s) as necessary.
^ There is excessive rod bearing clearance. Replace the rod bearing(s) as necessary.