Lockup vs Non Lock

[turbolc2]

From a physical stress standpoint,does lockup converter exert more stress on hard parts than a non locker?

 

[MeanBuicks]

It stands to reason that a lock-up, when locked, will be harsher on transmission hard parts simply because you've lost the hydraulic cushion noramlly provided by a converter.

 

[HOTTOGO]

Although minimal, unless your manually locking it under drag racing conditions. I doubt you'll really hurt anything in the trans either way, other than maybe the lock-up in the tc itself.