Other than the Torque converter...Which should automatically be replaced when the engine is...

I see alot of cranks installed that don't have the thrust surface clearance set right.....

I usually either clearence it with a dial-indicator and a prybar or put the harmonic balancer on with a rubber mallet....

To little clearence and you'll burn up the surface and it will ware pretty fast due to lack of oil and metal to metal contact...

looser clearence is more acceptable as you'll have good flow of oil around it so it won't ware near as fast....I run mine on the loose side usually...depends on the app....