How do i tell if i have a lock up or non lock up trans?
The one and only disadvantage is the clutch in the converter is not capable of withstanding much power without burning up.
Example would be if you were towing a trailer with a lockup trans truck, they highly recommend not using overdrive/lockup in the hills.
There is just not enough friction surface to withstand heavy loads on it.
Did you know that the friction material is only about a half inch or so wide, depending on the converters?
So you have a disk about the same size as a standard clutch inside the converter, but only about a half inch of the outside diameter of it has friction material surfaces.